diff --git a/frontend/src/query-tool/App.vue b/frontend/src/query-tool/App.vue
index bf238ba..2fbd691 100644
--- a/frontend/src/query-tool/App.vue
+++ b/frontend/src/query-tool/App.vue
@@ -5,20 +5,24 @@ import { replaceRuntimeHistory } from '../core/shell-navigation.js';
 
 import EquipmentView from './components/EquipmentView.vue';
 import LotTraceView from './components/LotTraceView.vue';
+import SerialReverseTraceView from './components/SerialReverseTraceView.vue';
 import { useEquipmentQuery } from './composables/useEquipmentQuery.js';
 import { useLotDetail } from './composables/useLotDetail.js';
 import { useLotLineage } from './composables/useLotLineage.js';
 import { useLotResolve } from './composables/useLotResolve.js';
+import { useReverseLineage } from './composables/useReverseLineage.js';
 import { normalizeText, parseArrayParam, parseInputValues, uniqueValues } from './utils/values.js';
 
 const TAB_LOT = 'lot';
+const TAB_REVERSE = 'reverse';
 const TAB_EQUIPMENT = 'equipment';
 
-const VALID_TABS = new Set([TAB_LOT, TAB_EQUIPMENT]);
+const VALID_TABS = new Set([TAB_LOT, TAB_REVERSE, TAB_EQUIPMENT]);
 
 const tabItems = Object.freeze([
-  { key: TAB_LOT, label: 'LOT 追蹤', subtitle: '血緣樹與批次詳情' },
-  { key: TAB_EQUIPMENT, label: '設備查詢', subtitle: '設備紀錄與時序視圖' },
+  { key: TAB_LOT, label: '批次追蹤(正向)', subtitle: '由批次展開下游血緣與明細' },
+  { key: TAB_REVERSE, label: '流水批反查(反向)', subtitle: '由成品流水號回溯上游批次' },
+  { key: TAB_EQUIPMENT, label: '設備生產批次追蹤', subtitle: '設備紀錄與時序視圖' },
 ]);
 
 function normalizeTopTab(value) {
@@ -29,13 +33,28 @@ function normalizeTopTab(value) {
 function readStateFromUrl() {
   const params = new URLSearchParams(window.location.search);
 
+  const tab = normalizeTopTab(params.get('tab'));
+  const legacyInputType = normalizeText(params.get('input_type'));
+  const legacyInputText = parseArrayParam(params, 'values').join('\n');
+  const legacySelectedContainerId = normalizeText(params.get('container_id'));
+  const legacyLotSubTab = normalizeText(params.get('lot_sub_tab')) || 'history';
+  const legacyWorkcenterGroups = parseArrayParam(params, 'workcenter_groups');
+
   return {
-    tab: normalizeTopTab(params.get('tab')),
-    inputType: normalizeText(params.get('input_type')) || 'lot_id',
-    inputText: parseArrayParam(params, 'values').join('\n'),
-    selectedContainerId: normalizeText(params.get('container_id')),
+    tab,
+    lotInputType: normalizeText(params.get('lot_input_type')) || (tab === TAB_LOT ? legacyInputType : '') || 'lot_id',
+    lotInputText: parseArrayParam(params, 'lot_values').join('\n') || (tab === TAB_LOT ? legacyInputText : ''),
+    lotSelectedContainerId: normalizeText(params.get('lot_container_id')) || (tab === TAB_LOT ? legacySelectedContainerId : ''),
     lotSubTab: normalizeText(params.get('lot_sub_tab')) || 'history',
-    workcenterGroups: parseArrayParam(params, 'workcenter_groups'),
+    lotWorkcenterGroups: parseArrayParam(params, 'workcenter_groups'),
+
+    reverseInputText: parseArrayParam(params, 'reverse_values').join('\n') || (tab === TAB_REVERSE ? legacyInputText : ''),
+    reverseSelectedContainerId: normalizeText(params.get('reverse_container_id')) || (tab === TAB_REVERSE ? legacySelectedContainerId : ''),
+    reverseSubTab: normalizeText(params.get('reverse_sub_tab')) || (tab === TAB_REVERSE ? legacyLotSubTab : 'history'),
+    reverseWorkcenterGroups: parseArrayParam(params, 'reverse_workcenter_groups').length
+      ? parseArrayParam(params, 'reverse_workcenter_groups')
+      : (tab === TAB_REVERSE ? legacyWorkcenterGroups : []),
+
     equipmentIds: parseArrayParam(params, 'equipment_ids'),
     startDate: normalizeText(params.get('start_date')),
     endDate: normalizeText(params.get('end_date')),
@@ -47,18 +66,35 @@ const initialState = readStateFromUrl();
 const activeTab = ref(initialState.tab);
 
 const lotResolve = useLotResolve({
-  inputType: initialState.inputType,
-  inputText: initialState.inputText,
+  inputType: initialState.lotInputType,
+  inputText: initialState.lotInputText,
+  allowedTypes: ['lot_id', 'work_order'],
+});
+
+const reverseResolve = useLotResolve({
+  inputType: 'serial_number',
+  inputText: initialState.reverseInputText,
+  allowedTypes: ['serial_number'],
 });
 
 const lotLineage = useLotLineage({
-  selectedContainerId: initialState.selectedContainerId,
+  selectedContainerId: initialState.lotSelectedContainerId,
+});
+
+const reverseLineage = useReverseLineage({
+  selectedContainerId: initialState.reverseSelectedContainerId,
 });
 
 const lotDetail = useLotDetail({
-  selectedContainerId: initialState.selectedContainerId,
+  selectedContainerId: initialState.lotSelectedContainerId,
   activeSubTab: initialState.lotSubTab,
-  workcenterGroups: initialState.workcenterGroups,
+  workcenterGroups: initialState.lotWorkcenterGroups,
+});
+
+const reverseDetail = useLotDetail({
+  selectedContainerId: initialState.reverseSelectedContainerId,
+  activeSubTab: initialState.reverseSubTab,
+  workcenterGroups: initialState.reverseWorkcenterGroups,
 });
 
 const equipmentQuery = useEquipmentQuery({
@@ -75,6 +111,11 @@ const selectedContainerName = computed(() => {
   return cid ? (lotLineage.nameMap.get(cid) || '') : '';
 });
 
+const reverseSelectedContainerName = computed(() => {
+  const cid = reverseDetail.selectedContainerId.value;
+  return cid ? (reverseLineage.nameMap.get(cid) || '') : '';
+});
+
 // Compatibility placeholders for existing table parity tests.
 const resolvedColumns = computed(() => Object.keys(lotResolve.resolvedLots.value[0] || {}));
 const historyColumns = computed(() => Object.keys(lotDetail.historyRows.value[0] || {}));
@@ -101,24 +142,40 @@ function buildUrlState() {
   const params = new URLSearchParams();
 
   params.set('tab', activeTab.value);
-  params.set('input_type', lotResolve.inputType.value);
 
+  params.set('lot_input_type', lotResolve.inputType.value);
   parseInputValues(lotResolve.inputText.value).forEach((value) => {
-    params.append('values', value);
+    params.append('lot_values', value);
+  });
+
+  parseInputValues(reverseResolve.inputText.value).forEach((value) => {
+    params.append('reverse_values', value);
   });
 
   if (lotDetail.selectedContainerId.value) {
-    params.set('container_id', lotDetail.selectedContainerId.value);
+    params.set('lot_container_id', lotDetail.selectedContainerId.value);
+  }
+
+  if (reverseDetail.selectedContainerId.value) {
+    params.set('reverse_container_id', reverseDetail.selectedContainerId.value);
   }
 
   if (lotDetail.activeSubTab.value) {
     params.set('lot_sub_tab', lotDetail.activeSubTab.value);
   }
 
+  if (reverseDetail.activeSubTab.value) {
+    params.set('reverse_sub_tab', reverseDetail.activeSubTab.value);
+  }
+
   uniqueValues(lotDetail.selectedWorkcenterGroups.value).forEach((group) => {
     params.append('workcenter_groups', group);
   });
 
+  uniqueValues(reverseDetail.selectedWorkcenterGroups.value).forEach((group) => {
+    params.append('reverse_workcenter_groups', group);
+  });
+
   uniqueValues(equipmentQuery.selectedEquipmentIds.value).forEach((id) => {
     params.append('equipment_ids', id);
   });
@@ -135,6 +192,29 @@ function buildUrlState() {
     params.set('equipment_sub_tab', equipmentQuery.activeSubTab.value);
   }
 
+  // Backward-compatible URL keys for deep links and existing tests.
+  if (activeTab.value === TAB_LOT) {
+    params.set('input_type', lotResolve.inputType.value);
+    parseInputValues(lotResolve.inputText.value).forEach((value) => {
+      params.append('values', value);
+    });
+    if (lotDetail.selectedContainerId.value) {
+      params.set('container_id', lotDetail.selectedContainerId.value);
+    }
+  } else if (activeTab.value === TAB_REVERSE) {
+    params.set('input_type', 'serial_number');
+    parseInputValues(reverseResolve.inputText.value).forEach((value) => {
+      params.append('values', value);
+    });
+    if (reverseDetail.selectedContainerId.value) {
+      params.set('container_id', reverseDetail.selectedContainerId.value);
+    }
+    params.set('lot_sub_tab', reverseDetail.activeSubTab.value);
+    uniqueValues(reverseDetail.selectedWorkcenterGroups.value).forEach((group) => {
+      params.append('workcenter_groups', group);
+    });
+  }
+
   return params.toString();
 }
 
@@ -159,11 +239,17 @@ async function applyStateFromUrl() {
 
   activeTab.value = state.tab;
 
-  lotResolve.setInputType(state.inputType);
-  lotResolve.setInputText(state.inputText);
+  lotResolve.setInputType(state.lotInputType);
+  lotResolve.setInputText(state.lotInputText);
+
+  reverseResolve.setInputType('serial_number');
+  reverseResolve.setInputText(state.reverseInputText);
 
   lotDetail.activeSubTab.value = state.lotSubTab;
-  lotDetail.selectedWorkcenterGroups.value = state.workcenterGroups;
+  lotDetail.selectedWorkcenterGroups.value = state.lotWorkcenterGroups;
+
+  reverseDetail.activeSubTab.value = state.reverseSubTab;
+  reverseDetail.selectedWorkcenterGroups.value = state.reverseWorkcenterGroups;
 
   equipmentQuery.selectedEquipmentIds.value = state.equipmentIds;
   equipmentQuery.startDate.value = state.startDate || equipmentQuery.startDate.value;
@@ -172,9 +258,14 @@ async function applyStateFromUrl() {
 
   suppressUrlSync.value = false;
 
-  if (state.selectedContainerId) {
-    lotLineage.selectNode(state.selectedContainerId);
-    await lotDetail.setSelectedContainerId(state.selectedContainerId);
+  if (state.lotSelectedContainerId) {
+    lotLineage.selectNode(state.lotSelectedContainerId);
+    await lotDetail.setSelectedContainerId(state.lotSelectedContainerId);
+  }
+
+  if (state.reverseSelectedContainerId) {
+    reverseLineage.selectNode(state.reverseSelectedContainerId);
+    await reverseDetail.setSelectedContainerId(state.reverseSelectedContainerId);
   }
 }
 
@@ -193,12 +284,22 @@ async function handleResolveLots() {
   }
 
   // Build tree only — don't auto-select or load detail data.
-  // User clicks a node to trigger detail/timeline loading on demand.
   await lotLineage.primeResolvedLots(lotResolve.resolvedLots.value);
   lotLineage.clearSelection();
   lotDetail.clearTabData();
 }
 
+async function handleResolveReverse() {
+  const result = await reverseResolve.resolveLots();
+  if (!result?.ok) {
+    return;
+  }
+
+  await reverseLineage.primeResolvedLots(reverseResolve.resolvedLots.value);
+  reverseLineage.clearSelection();
+  reverseDetail.clearTabData();
+}
+
 async function handleSelectNodes(containerIds) {
   lotLineage.setSelectedNodes(containerIds);
 
@@ -211,18 +312,41 @@ async function handleSelectNodes(containerIds) {
   await lotDetail.setSelectedContainerIds([...seen]);
 }
 
+async function handleSelectReverseNodes(containerIds) {
+  reverseLineage.setSelectedNodes(containerIds);
+
+  const seen = new Set();
+  containerIds.forEach((cid) => {
+    reverseLineage.getSubtreeCids(cid).forEach((id) => seen.add(id));
+  });
+
+  await reverseDetail.setSelectedContainerIds([...seen]);
+}
+
 async function handleChangeLotSubTab(tab) {
   await lotDetail.setActiveSubTab(tab);
 }
 
+async function handleChangeReverseSubTab(tab) {
+  await reverseDetail.setActiveSubTab(tab);
+}
+
 async function handleWorkcenterGroupChange(groups) {
   await lotDetail.setSelectedWorkcenterGroups(groups);
 }
 
+async function handleReverseWorkcenterGroupChange(groups) {
+  await reverseDetail.setSelectedWorkcenterGroups(groups);
+}
+
 async function handleExportLotTab(tab) {
   await lotDetail.exportSubTab(tab);
 }
 
+async function handleExportReverseTab(tab) {
+  await reverseDetail.exportSubTab(tab);
+}
+
 async function handleChangeEquipmentSubTab(tab) {
   await equipmentQuery.setActiveSubTab(tab, { autoQuery: true });
 }
@@ -239,12 +363,18 @@ onMounted(async () => {
   window.addEventListener('popstate', handlePopState);
   await Promise.all([
     lotDetail.loadWorkcenterGroups(),
+    reverseDetail.loadWorkcenterGroups(),
     equipmentQuery.bootstrap(),
   ]);
 
-  if (initialState.selectedContainerId) {
-    lotLineage.selectNode(initialState.selectedContainerId);
-    await lotDetail.setSelectedContainerId(initialState.selectedContainerId);
+  if (initialState.lotSelectedContainerId) {
+    lotLineage.selectNode(initialState.lotSelectedContainerId);
+    await lotDetail.setSelectedContainerId(initialState.lotSelectedContainerId);
+  }
+
+  if (initialState.reverseSelectedContainerId) {
+    reverseLineage.selectNode(initialState.reverseSelectedContainerId);
+    await reverseDetail.setSelectedContainerId(initialState.reverseSelectedContainerId);
   }
 
   syncUrlState();
@@ -257,11 +387,18 @@ onBeforeUnmount(() => {
 watch(
   [
     activeTab,
+
     lotResolve.inputType,
     lotResolve.inputText,
     lotDetail.selectedContainerId,
     lotDetail.activeSubTab,
     lotDetail.selectedWorkcenterGroups,
+
+    reverseResolve.inputText,
+    reverseDetail.selectedContainerId,
+    reverseDetail.activeSubTab,
+    reverseDetail.selectedWorkcenterGroups,
+
     equipmentQuery.selectedEquipmentIds,
     equipmentQuery.startDate,
     equipmentQuery.endDate,
@@ -281,13 +418,22 @@ watch(
     }
   },
 );
+
+watch(
+  () => reverseLineage.selectedContainerId.value,
+  (nextSelection) => {
+    if (nextSelection && nextSelection !== reverseDetail.selectedContainerId.value) {
+      void reverseDetail.setSelectedContainerId(nextSelection);
+    }
+  },
+);
 </script>
 
 <template>
   <div class="u-content-shell space-y-3 p-3 lg:p-5">
     <header class="rounded-shell bg-gradient-to-r from-brand-500 to-accent-500 px-5 py-4 text-white shadow-shell">
       <h1 class="text-xl font-semibold tracking-wide">批次追蹤工具</h1>
-      <p class="mt-1 text-xs text-indigo-100">LOT 追蹤與設備查詢整合入口</p>
+      <p class="mt-1 text-xs text-indigo-100">正向/反向批次追溯與設備生產批次查詢整合入口</p>
     </header>
 
     <section class="rounded-shell border border-stroke-panel bg-surface-card shadow-panel">
@@ -354,6 +500,43 @@ watch(
           @export-lot-tab="handleExportLotTab"
         />
 
+        <SerialReverseTraceView
+          v-show="activeTab === TAB_REVERSE"
+          :input-type="reverseResolve.inputType.value"
+          :input-text="reverseResolve.inputText.value"
+          :input-type-options="reverseResolve.inputTypeOptions"
+          :input-limit="reverseResolve.inputLimit.value"
+          :resolving="reverseResolve.loading.resolving"
+          :resolve-error-message="reverseResolve.errorMessage.value"
+          :resolve-success-message="reverseResolve.successMessage.value"
+          :tree-roots="reverseLineage.treeRoots.value"
+          :not-found="reverseResolve.notFound.value"
+          :lineage-map="reverseLineage.lineageMap"
+          :name-map="reverseLineage.nameMap"
+          :leaf-serials="reverseLineage.leafSerials"
+          :lineage-loading="reverseLineage.lineageLoading.value"
+          :selected-container-ids="reverseLineage.selectedContainerIds.value"
+          :selected-container-id="reverseDetail.selectedContainerId.value"
+          :selected-container-name="reverseSelectedContainerName"
+          :detail-container-ids="reverseDetail.selectedContainerIds.value"
+          :detail-loading="reverseDetail.loading"
+          :detail-loaded="reverseDetail.loaded"
+          :detail-exporting="reverseDetail.exporting"
+          :detail-errors="reverseDetail.errors"
+          :active-sub-tab="reverseDetail.activeSubTab.value"
+          :history-rows="reverseDetail.historyRows.value"
+          :association-rows="reverseDetail.associationRows"
+          :workcenter-groups="reverseDetail.workcenterGroups.value"
+          :selected-workcenter-groups="reverseDetail.selectedWorkcenterGroups.value"
+          @update:input-type="reverseResolve.setInputType($event)"
+          @update:input-text="reverseResolve.setInputText($event)"
+          @resolve="handleResolveReverse"
+          @select-nodes="handleSelectReverseNodes"
+          @change-sub-tab="handleChangeReverseSubTab"
+          @update-workcenter-groups="handleReverseWorkcenterGroupChange"
+          @export-lot-tab="handleExportReverseTab"
+        />
+
         <EquipmentView
           v-show="activeTab === TAB_EQUIPMENT"
           :equipment-options="equipmentQuery.equipmentOptionItems.value"
diff --git a/frontend/src/query-tool/components/LineageTreeChart.vue b/frontend/src/query-tool/components/LineageTreeChart.vue
index 2d4e284..bdec11f 100644
--- a/frontend/src/query-tool/components/LineageTreeChart.vue
+++ b/frontend/src/query-tool/components/LineageTreeChart.vue
@@ -47,6 +47,22 @@ const props = defineProps({
     type: Boolean,
     default: false,
   },
+  title: {
+    type: String,
+    default: '批次血緣樹',
+  },
+  description: {
+    type: String,
+    default: '生產流程追溯：晶批 → 切割 → 封裝 → 成品（點擊節點可多選）',
+  },
+  emptyMessage: {
+    type: String,
+    default: '目前尚無 LOT 根節點，請先在上方解析。',
+  },
+  showSerialLegend: {
+    type: Boolean,
+    default: true,
+  },
 });
 
 const emit = defineEmits(['select-nodes']);
@@ -302,8 +318,8 @@ function handleNodeClick(params) {
   <section class="rounded-card border border-stroke-soft bg-white p-3 shadow-soft">
     <div class="mb-3 flex flex-wrap items-center justify-between gap-2">
       <div>
-        <h3 class="text-sm font-semibold text-slate-800">批次血緣樹</h3>
-        <p class="text-xs text-slate-500">生產流程追溯：晶批 → 切割 → 封裝 → 成品（點擊節點可多選）</p>
+        <h3 class="text-sm font-semibold text-slate-800">{{ title }}</h3>
+        <p class="text-xs text-slate-500">{{ description }}</p>
       </div>
 
       <div class="flex items-center gap-3">
@@ -320,7 +336,7 @@ function handleNodeClick(params) {
             <span class="inline-block size-2.5 rounded-full" :style="{ background: NODE_COLORS.leaf }" />
             末端
           </span>
-          <span class="inline-flex items-center gap-1">
+          <span v-if="showSerialLegend" class="inline-flex items-center gap-1">
             <span class="inline-block size-2.5 rotate-45" :style="{ background: NODE_COLORS.serial, width: '8px', height: '8px' }" />
             序列號
           </span>
@@ -338,7 +354,7 @@ function handleNodeClick(params) {
 
     <!-- Empty state -->
     <div v-else-if="!hasData" class="rounded-card border border-dashed border-stroke-soft bg-surface-muted/40 px-3 py-10 text-center text-xs text-slate-500">
-      目前尚無 LOT 根節點，請先在上方解析。
+      {{ emptyMessage }}
     </div>
 
     <!-- ECharts Tree -->
diff --git a/frontend/src/query-tool/components/SerialReverseTraceView.vue b/frontend/src/query-tool/components/SerialReverseTraceView.vue
new file mode 100644
index 0000000..16f32d2
--- /dev/null
+++ b/frontend/src/query-tool/components/SerialReverseTraceView.vue
@@ -0,0 +1,177 @@
+<script setup>
+import QueryBar from './QueryBar.vue';
+import LineageTreeChart from './LineageTreeChart.vue';
+import LotDetail from './LotDetail.vue';
+
+const props = defineProps({
+  inputType: {
+    type: String,
+    default: 'serial_number',
+  },
+  inputText: {
+    type: String,
+    default: '',
+  },
+  inputTypeOptions: {
+    type: Array,
+    default: () => [],
+  },
+  inputLimit: {
+    type: Number,
+    default: 50,
+  },
+  resolving: {
+    type: Boolean,
+    default: false,
+  },
+  resolveErrorMessage: {
+    type: String,
+    default: '',
+  },
+  resolveSuccessMessage: {
+    type: String,
+    default: '',
+  },
+  treeRoots: {
+    type: Array,
+    default: () => [],
+  },
+  notFound: {
+    type: Array,
+    default: () => [],
+  },
+  lineageMap: {
+    type: Object,
+    required: true,
+  },
+  nameMap: {
+    type: Object,
+    default: () => new Map(),
+  },
+  leafSerials: {
+    type: Object,
+    default: () => new Map(),
+  },
+  lineageLoading: {
+    type: Boolean,
+    default: false,
+  },
+  selectedContainerIds: {
+    type: Array,
+    default: () => [],
+  },
+  selectedContainerId: {
+    type: String,
+    default: '',
+  },
+  selectedContainerName: {
+    type: String,
+    default: '',
+  },
+  detailContainerIds: {
+    type: Array,
+    default: () => [],
+  },
+  detailLoading: {
+    type: Object,
+    required: true,
+  },
+  detailLoaded: {
+    type: Object,
+    required: true,
+  },
+  detailExporting: {
+    type: Object,
+    required: true,
+  },
+  detailErrors: {
+    type: Object,
+    required: true,
+  },
+  activeSubTab: {
+    type: String,
+    default: 'history',
+  },
+  historyRows: {
+    type: Array,
+    default: () => [],
+  },
+  associationRows: {
+    type: Object,
+    required: true,
+  },
+  workcenterGroups: {
+    type: Array,
+    default: () => [],
+  },
+  selectedWorkcenterGroups: {
+    type: Array,
+    default: () => [],
+  },
+});
+
+const emit = defineEmits([
+  'update:inputType',
+  'update:inputText',
+  'resolve',
+  'select-nodes',
+  'change-sub-tab',
+  'update-workcenter-groups',
+  'export-lot-tab',
+]);
+</script>
+
+<template>
+  <div class="space-y-3">
+    <QueryBar
+      :input-type="inputType"
+      :input-text="inputText"
+      :input-type-options="inputTypeOptions"
+      :input-limit="inputLimit"
+      :resolving="resolving"
+      :error-message="resolveErrorMessage"
+      @update:input-type="emit('update:inputType', $event)"
+      @update:input-text="emit('update:inputText', $event)"
+      @resolve="emit('resolve')"
+    />
+
+    <p v-if="resolveSuccessMessage" class="rounded-card border border-state-success/40 bg-emerald-50 px-3 py-2 text-xs text-emerald-700">
+      {{ resolveSuccessMessage }}
+    </p>
+
+    <LineageTreeChart
+      :tree-roots="treeRoots"
+      :not-found="notFound"
+      :lineage-map="lineageMap"
+      :name-map="nameMap"
+      :leaf-serials="leafSerials"
+      :selected-container-ids="selectedContainerIds"
+      :loading="lineageLoading"
+      title="流水批反查樹"
+      description="由成品流水號往上追溯來源批次與祖先節點（點擊節點可多選）"
+      empty-message="目前尚無可反查節點，請先輸入成品流水號。"
+      :show-serial-legend="false"
+      @select-nodes="emit('select-nodes', $event)"
+    />
+
+    <LotDetail
+      :selected-container-id="selectedContainerId"
+      :selected-container-name="selectedContainerName"
+      :selected-container-ids="detailContainerIds"
+      :clicked-container-ids="selectedContainerIds"
+      :name-map="nameMap"
+      :active-sub-tab="activeSubTab"
+      :loading="detailLoading"
+      :loaded="detailLoaded"
+      :exporting="detailExporting"
+      :errors="detailErrors"
+      :history-rows="historyRows"
+      :association-rows="associationRows"
+      :workcenter-groups="workcenterGroups"
+      :selected-workcenter-groups="selectedWorkcenterGroups"
+      @change-sub-tab="emit('change-sub-tab', $event)"
+      @update-workcenter-groups="emit('update-workcenter-groups', $event)"
+      @export-tab="emit('export-lot-tab', $event)"
+    />
+  </div>
+</template>
diff --git a/frontend/src/query-tool/composables/useLotResolve.js b/frontend/src/query-tool/composables/useLotResolve.js
index fbfbbcf..c796fad 100644
--- a/frontend/src/query-tool/composables/useLotResolve.js
+++ b/frontend/src/query-tool/composables/useLotResolve.js
@@ -23,10 +23,28 @@ function normalizeInputType(value) {
   return 'lot_id';
 }
 
+function normalizeAllowedTypes(input) {
+  const values = Array.isArray(input)
+    ? input.map((item) => String(item || '').trim()).filter(Boolean)
+    : [];
+  const filtered = values.filter((value) => Boolean(INPUT_LIMITS[value]));
+  if (filtered.length === 0) {
+    return ['lot_id', 'serial_number', 'work_order'];
+  }
+  return filtered;
+}
+
 export function useLotResolve(initial = {}) {
   ensureMesApiAvailable();
 
+  const allowedTypes = normalizeAllowedTypes(initial.allowedTypes);
+  const optionPool = INPUT_TYPE_OPTIONS.filter((option) => allowedTypes.includes(option.value));
+  const defaultType = optionPool[0]?.value || 'lot_id';
+
   const inputType = ref(normalizeInputType(initial.inputType));
+  if (!allowedTypes.includes(inputType.value)) {
+    inputType.value = defaultType;
+  }
   const inputText = ref(String(initial.inputText || ''));
 
   const resolvedLots = ref([]);
@@ -40,7 +58,7 @@ export function useLotResolve(initial = {}) {
     resolving: false,
   });
 
-  const inputTypeOptions = INPUT_TYPE_OPTIONS;
+  const inputTypeOptions = optionPool;
   const inputValues = computed(() => parseInputValues(inputText.value));
   const inputLimit = computed(() => INPUT_LIMITS[inputType.value] || 50);
 
@@ -62,7 +80,8 @@ export function useLotResolve(initial = {}) {
   }
 
   function setInputType(nextType) {
-    inputType.value = normalizeInputType(nextType);
+    const normalized = normalizeInputType(nextType);
+    inputType.value = allowedTypes.includes(normalized) ? normalized : defaultType;
   }
 
   function setInputText(text) {
@@ -71,7 +90,11 @@ export function useLotResolve(initial = {}) {
 
   function validateInput(values) {
     if (values.length === 0) {
-      return '請輸入 LOT/流水號/工單條件';
+      const labels = inputTypeOptions
+        .map((option) => option.label)
+        .filter(Boolean)
+        .join('/');
+      return labels ? `請輸入 ${labels} 條件` : '請輸入查詢條件';
     }
 
     const limit = INPUT_LIMITS[inputType.value] || 50;
diff --git a/frontend/src/query-tool/composables/useReverseLineage.js b/frontend/src/query-tool/composables/useReverseLineage.js
new file mode 100644
index 0000000..03257a3
--- /dev/null
+++ b/frontend/src/query-tool/composables/useReverseLineage.js
@@ -0,0 +1,389 @@
+import { computed, reactive, ref } from 'vue';
+
+import { apiPost, ensureMesApiAvailable } from '../../core/api.js';
+import { normalizeText, uniqueValues } from '../utils/values.js';
+
+const MAX_CONCURRENCY = 3;
+const MAX_429_RETRY = 3;
+
+function emptyLineageEntry() {
+  return {
+    children: [],
+    loading: false,
+    error: '',
+    fetched: false,
+    lastUpdatedAt: 0,
+  };
+}
+
+function extractContainerId(row) {
+  if (!row || typeof row !== 'object') {
+    return '';
+  }
+  return normalizeText(row.container_id || row.CONTAINERID || row.containerId);
+}
+
+function createSemaphore(maxConcurrency) {
+  const queue = [];
+  let active = 0;
+
+  function pump() {
+    if (active >= maxConcurrency || queue.length === 0) {
+      return;
+    }
+
+    const item = queue.shift();
+    active += 1;
+
+    Promise.resolve()
+      .then(item.task)
+      .then(item.resolve)
+      .catch(item.reject)
+      .finally(() => {
+        active = Math.max(0, active - 1);
+        pump();
+      });
+  }
+
+  return {
+    schedule(task) {
+      return new Promise((resolve, reject) => {
+        queue.push({ task, resolve, reject });
+        pump();
+      });
+    },
+    clear() {
+      queue.length = 0;
+    },
+  };
+}
+
+function sleep(ms) {
+  return new Promise((resolve) => window.setTimeout(resolve, ms));
+}
+
+export function useReverseLineage(initial = {}) {
+  ensureMesApiAvailable();
+
+  const lineageMap = reactive(new Map());
+  const nameMap = reactive(new Map());
+  const leafSerials = reactive(new Map());
+  const selectedContainerId = ref(normalizeText(initial.selectedContainerId));
+  const selectedContainerIds = ref(
+    initial.selectedContainerId ? [normalizeText(initial.selectedContainerId)] : [],
+  );
+  const rootRows = ref([]);
+  const rootContainerIds = ref([]);
+  const treeRoots = ref([]);
+
+  const inFlight = new Map();
+  const semaphore = createSemaphore(MAX_CONCURRENCY);
+  let generation = 0;
+
+  function ensureEntry(containerId) {
+    const id = normalizeText(containerId);
+    if (!id) {
+      return null;
+    }
+
+    if (!lineageMap.has(id)) {
+      lineageMap.set(id, emptyLineageEntry());
+    }
+
+    return lineageMap.get(id);
+  }
+
+  function patchEntry(containerId, patch) {
+    const id = normalizeText(containerId);
+    if (!id) {
+      return;
+    }
+
+    const previous = ensureEntry(id) || emptyLineageEntry();
+    lineageMap.set(id, {
+      ...previous,
+      ...patch,
+    });
+  }
+
+  function getEntry(containerId) {
+    const id = normalizeText(containerId);
+    if (!id) {
+      return emptyLineageEntry();
+    }
+    return lineageMap.get(id) || emptyLineageEntry();
+  }
+
+  function getChildren(containerId) {
+    const entry = getEntry(containerId);
+    return Array.isArray(entry.children) ? entry.children : [];
+  }
+
+  function getSubtreeCids(containerId) {
+    const id = normalizeText(containerId);
+    if (!id) {
+      return [];
+    }
+    const result = [];
+    const visited = new Set();
+    function walk(nodeId) {
+      if (!nodeId || visited.has(nodeId)) {
+        return;
+      }
+      visited.add(nodeId);
+      result.push(nodeId);
+      getChildren(nodeId).forEach(walk);
+    }
+    walk(id);
+    return result;
+  }
+
+  function selectNode(containerId) {
+    const id = normalizeText(containerId);
+    selectedContainerId.value = id;
+    if (id && !selectedContainerIds.value.includes(id)) {
+      selectedContainerIds.value = [id];
+    }
+  }
+
+  function setSelectedNodes(cids) {
+    const normalized = (Array.isArray(cids) ? cids : [])
+      .map(normalizeText)
+      .filter(Boolean);
+    selectedContainerIds.value = uniqueValues(normalized);
+    selectedContainerId.value = normalized[0] || '';
+  }
+
+  function clearSelection() {
+    selectedContainerId.value = '';
+    selectedContainerIds.value = [];
+  }
+
+  const lineageLoading = computed(() => {
+    for (const entry of lineageMap.values()) {
+      if (entry.loading) {
+        return true;
+      }
+    }
+    return false;
+  });
+
+  async function requestLineageWithRetry(containerIds) {
+    let attempt = 0;
+
+    while (attempt <= MAX_429_RETRY) {
+      try {
+        return await apiPost(
+          '/api/trace/lineage',
+          {
+            profile: 'query_tool_reverse',
+            container_ids: containerIds,
+          },
+          { timeout: 60000, silent: true },
+        );
+      } catch (error) {
+        const status = Number(error?.status || 0);
+        if (status !== 429 || attempt >= MAX_429_RETRY) {
+          throw error;
+        }
+
+        const retryAfter = Number(error?.retryAfterSeconds || 0);
+        const fallbackSeconds = 2 ** attempt;
+        const waitSeconds = Math.max(1, Math.min(30, retryAfter || fallbackSeconds));
+        await sleep(waitSeconds * 1000);
+        attempt += 1;
+      }
+    }
+
+    return null;
+  }
+
+  function normalizeParentMap(payload) {
+    const parentMapData = payload?.parent_map;
+    if (!parentMapData || typeof parentMapData !== 'object') {
+      return {};
+    }
+
+    const normalized = {};
+    Object.entries(parentMapData).forEach(([childId, parentIds]) => {
+      const child = normalizeText(childId);
+      if (!child) {
+        return;
+      }
+      const values = Array.isArray(parentIds) ? parentIds : [];
+      normalized[child] = uniqueValues(values.map((parentId) => normalizeText(parentId)));
+    });
+    return normalized;
+  }
+
+  function populateReverseTree(payload, requestedRoots = []) {
+    const parentMap = normalizeParentMap(payload);
+    const names = payload?.names;
+
+    if (names && typeof names === 'object') {
+      Object.entries(names).forEach(([cid, name]) => {
+        if (cid && name) {
+          nameMap.set(normalizeText(cid), String(name));
+        }
+      });
+    }
+
+    Object.entries(parentMap).forEach(([childId, parentIds]) => {
+      patchEntry(childId, {
+        children: uniqueValues(parentIds || []),
+        loading: false,
+        fetched: true,
+        error: '',
+        lastUpdatedAt: Date.now(),
+      });
+    });
+
+    const allParentIds = new Set();
+    Object.values(parentMap).forEach((parentIds) => {
+      (parentIds || []).forEach((parentId) => {
+        const normalized = normalizeText(parentId);
+        if (normalized) {
+          allParentIds.add(normalized);
+        }
+      });
+    });
+
+    allParentIds.forEach((parentId) => {
+      if (!parentMap[parentId] && !getEntry(parentId).fetched) {
+        patchEntry(parentId, {
+          children: [],
+          loading: false,
+          fetched: true,
+          error: '',
+          lastUpdatedAt: Date.now(),
+        });
+      }
+    });
+
+    const roots = (payload?.roots || requestedRoots || [])
+      .map((cid) => normalizeText(cid))
+      .filter(Boolean);
+
+    roots.forEach((cid) => {
+      if (!getEntry(cid).fetched) {
+        patchEntry(cid, {
+          children: uniqueValues(parentMap[cid] || []),
+          loading: false,
+          fetched: true,
+          error: '',
+          lastUpdatedAt: Date.now(),
+        });
+      }
+    });
+
+    treeRoots.value = roots;
+  }
+
+  async function fetchLineage(containerIds, { force = false } = {}) {
+    const ids = (Array.isArray(containerIds) ? containerIds : [containerIds])
+      .map((c) => normalizeText(c))
+      .filter(Boolean);
+
+    if (ids.length === 0) {
+      return null;
+    }
+
+    if (!force && ids.length === 1) {
+      const existing = getEntry(ids[0]);
+      if (existing.fetched) {
+        return existing;
+      }
+    }
+
+    const cacheKey = [...ids].sort().join(',');
+    if (inFlight.has(cacheKey)) {
+      return inFlight.get(cacheKey);
+    }
+
+    const runGeneration = generation;
+    ids.forEach((id) => {
+      patchEntry(id, { loading: true, error: '' });
+    });
+
+    const promise = semaphore
+      .schedule(async () => {
+        try {
+          const payload = await requestLineageWithRetry(ids);
+          if (runGeneration !== generation) {
+            return null;
+          }
+
+          populateReverseTree(payload, ids);
+          return ids.length === 1 ? getEntry(ids[0]) : null;
+        } catch (error) {
+          if (runGeneration !== generation) {
+            return null;
+          }
+
+          ids.forEach((id) => {
+            patchEntry(id, {
+              children: [],
+              loading: false,
+              fetched: true,
+              error: error?.message || '反向血緣查詢失敗',
+              lastUpdatedAt: Date.now(),
+            });
+          });
+          return ids.length === 1 ? getEntry(ids[0]) : null;
+        } finally {
+          inFlight.delete(cacheKey);
+        }
+      })
+      .catch((error) => {
+        inFlight.delete(cacheKey);
+        throw error;
+      });
+
+    inFlight.set(cacheKey, promise);
+    return promise;
+  }
+
+  function resetLineageState() {
+    generation += 1;
+    inFlight.clear();
+    semaphore.clear();
+    lineageMap.clear();
+    nameMap.clear();
+    leafSerials.clear();
+    rootRows.value = [];
+    rootContainerIds.value = [];
+    treeRoots.value = [];
+    clearSelection();
+  }
+
+  async function primeResolvedLots(rows) {
+    resetLineageState();
+    rootRows.value = Array.isArray(rows) ? [...rows] : [];
+
+    const ids = uniqueValues(rootRows.value.map((row) => extractContainerId(row)).filter(Boolean));
+    rootContainerIds.value = ids;
+    if (ids.length === 0) {
+      return;
+    }
+    await fetchLineage(ids, { force: true });
+  }
+
+  return {
+    lineageMap,
+    nameMap,
+    leafSerials,
+    selectedContainerId,
+    selectedContainerIds,
+    rootRows,
+    rootContainerIds,
+    treeRoots,
+    lineageLoading,
+    selectNode,
+    setSelectedNodes,
+    clearSelection,
+    getSubtreeCids,
+    fetchLineage,
+    resetLineageState,
+    primeResolvedLots,
+  };
+}
diff --git a/src/mes_dashboard/routes/trace_routes.py b/src/mes_dashboard/routes/trace_routes.py
index 4a16a7d..b2d093c 100644
--- a/src/mes_dashboard/routes/trace_routes.py
+++ b/src/mes_dashboard/routes/trace_routes.py
@@ -38,8 +38,13 @@ TRACE_LINEAGE_TIMEOUT_SECONDS = 60.0
 TRACE_CACHE_TTL_SECONDS = 300
 
 PROFILE_QUERY_TOOL = "query_tool"
+PROFILE_QUERY_TOOL_REVERSE = "query_tool_reverse"
 PROFILE_MID_SECTION_DEFECT = "mid_section_defect"
-SUPPORTED_PROFILES = {PROFILE_QUERY_TOOL, PROFILE_MID_SECTION_DEFECT}
+SUPPORTED_PROFILES = {
+    PROFILE_QUERY_TOOL,
+    PROFILE_QUERY_TOOL_REVERSE,
+    PROFILE_MID_SECTION_DEFECT,
+}
 
 QUERY_TOOL_RESOLVE_TYPES = {"lot_id", "serial_number", "work_order"}
 SUPPORTED_EVENT_DOMAINS = {
@@ -113,8 +118,8 @@ def _seed_cache_key(profile: str, params: Dict[str, Any]) -> str:
     return f"trace:seed:{profile}:{_hash_payload(params)}"
 
 
-def _lineage_cache_key(container_ids: List[str]) -> str:
-    return f"trace:lineage:{_short_hash(sorted(container_ids))}"
+def _lineage_cache_key(profile: str, container_ids: List[str]) -> str:
+    return f"trace:lineage:{profile}:{_short_hash(sorted(container_ids))}"
 
 
 def _events_cache_key(profile: str, domains: List[str], container_ids: List[str]) -> str:
@@ -353,7 +358,7 @@ def seed_resolve():
     )
 
     started = time.monotonic()
-    if profile == PROFILE_QUERY_TOOL:
+    if profile in {PROFILE_QUERY_TOOL, PROFILE_QUERY_TOOL_REVERSE}:
         resolved, route_error = _seed_resolve_query_tool(params)
     else:
         resolved, route_error = _seed_resolve_mid_section_defect(params)
@@ -391,7 +396,7 @@ def lineage():
     if not container_ids:
         return _error("INVALID_PARAMS", "container_ids must contain at least one id", 400)
 
-    lineage_cache_key = _lineage_cache_key(container_ids)
+    lineage_cache_key = _lineage_cache_key(profile, container_ids)
     cached = cache_get(lineage_cache_key)
     if cached is not None:
         return jsonify(cached)
@@ -405,7 +410,27 @@ def lineage():
 
     started = time.monotonic()
     try:
-        forward_tree = LineageEngine.resolve_forward_tree(container_ids)
+        if profile == PROFILE_QUERY_TOOL_REVERSE:
+            reverse_graph = LineageEngine.resolve_full_genealogy(container_ids)
+            response = _build_lineage_response(
+                container_ids,
+                reverse_graph.get("ancestors", {}),
+                cid_to_name=reverse_graph.get("cid_to_name"),
+                parent_map=reverse_graph.get("parent_map"),
+                merge_edges=reverse_graph.get("merge_edges"),
+            )
+            response["roots"] = list(container_ids)
+        else:
+            forward_tree = LineageEngine.resolve_forward_tree(container_ids)
+            cid_to_name = forward_tree.get("cid_to_name") or {}
+            response = {
+                "stage": "lineage",
+                "roots": forward_tree.get("roots", []),
+                "children_map": forward_tree.get("children_map", {}),
+                "leaf_serials": forward_tree.get("leaf_serials", {}),
+                "names": {cid: name for cid, name in cid_to_name.items() if name},
+                "total_nodes": forward_tree.get("total_nodes", 0),
+            }
     except Exception as exc:
         if _is_timeout_exception(exc):
             return _error("LINEAGE_TIMEOUT", "lineage query timed out", 504)
@@ -416,15 +441,6 @@ def lineage():
     if elapsed > TRACE_LINEAGE_TIMEOUT_SECONDS:
         return _error("LINEAGE_TIMEOUT", "lineage query timed out", 504)
 
-    cid_to_name = forward_tree.get("cid_to_name") or {}
-    response: Dict[str, Any] = {
-        "stage": "lineage",
-        "roots": forward_tree.get("roots", []),
-        "children_map": forward_tree.get("children_map", {}),
-        "leaf_serials": forward_tree.get("leaf_serials", {}),
-        "names": {cid: name for cid, name in cid_to_name.items() if name},
-        "total_nodes": forward_tree.get("total_nodes", 0),
-    }
     cache_set(lineage_cache_key, response, ttl=TRACE_CACHE_TTL_SECONDS)
     return jsonify(response)
 
diff --git a/tests/e2e/test_query_tool_e2e.py b/tests/e2e/test_query_tool_e2e.py
index 1a6bd30..aba32c5 100644
--- a/tests/e2e/test_query_tool_e2e.py
+++ b/tests/e2e/test_query_tool_e2e.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-"""E2E coverage for the Query Tool page (LOT 追蹤 + 設備查詢 tabs)."""
+"""E2E coverage for the Query Tool page tabs and core query flows."""
 
 from __future__ import annotations
 
@@ -262,10 +262,12 @@ class TestQueryToolPageE2E:
         heading = page.get_by_role("heading", name="批次追蹤工具")
         expect(heading).to_be_visible()
 
-        # Both tab buttons should exist
-        lot_tab = page.locator("button", has_text="LOT 追蹤")
-        equipment_tab = page.locator("button", has_text="設備查詢")
+        # All tab buttons should exist
+        lot_tab = page.locator("button", has_text="批次追蹤(正向)")
+        reverse_tab = page.locator("button", has_text="流水批反查(反向)")
+        equipment_tab = page.locator("button", has_text="設備生產批次追蹤")
         expect(lot_tab).to_be_visible()
+        expect(reverse_tab).to_be_visible()
         expect(equipment_tab).to_be_visible()
 
     def test_lot_tab_resolve_work_order(self, page: Page, app_server: str):
@@ -388,12 +390,12 @@ class TestQueryToolPageE2E:
         textarea.fill("GA26010001")
 
         # Switch to equipment tab
-        equipment_tab = page.locator("button", has_text="設備查詢")
+        equipment_tab = page.locator("button", has_text="設備生產批次追蹤")
         equipment_tab.click()
         page.wait_for_timeout(500)
 
         # Switch back to LOT tab
-        lot_tab = page.locator("button", has_text="LOT 追蹤")
+        lot_tab = page.locator("button", has_text="批次追蹤(正向)")
         lot_tab.click()
         page.wait_for_timeout(500)
 
diff --git a/tests/test_trace_routes.py b/tests/test_trace_routes.py
index 6fafd9c..d2dbf11 100644
--- a/tests/test_trace_routes.py
+++ b/tests/test_trace_routes.py
@@ -59,6 +59,38 @@ def test_seed_resolve_query_tool_success(mock_resolve_lots):
     assert payload['cache_key'].startswith('trace:seed:query_tool:')
 
 
+@patch('mes_dashboard.routes.trace_routes.resolve_lots')
+def test_seed_resolve_query_tool_reverse_success(mock_resolve_lots):
+    mock_resolve_lots.return_value = {
+        'data': [
+            {
+                'container_id': 'CID-SN',
+                'lot_id': 'LOT-SN',
+            }
+        ]
+    }
+
+    client = _client()
+    response = client.post(
+        '/api/trace/seed-resolve',
+        json={
+            'profile': 'query_tool_reverse',
+            'params': {
+                'resolve_type': 'serial_number',
+                'values': ['SN-001'],
+            },
+        },
+    )
+
+    assert response.status_code == 200
+    payload = response.get_json()
+    assert payload['stage'] == 'seed-resolve'
+    assert payload['seed_count'] == 1
+    assert payload['seeds'][0]['container_id'] == 'CID-SN'
+    assert payload['seeds'][0]['container_name'] == 'LOT-SN'
+    assert payload['cache_key'].startswith('trace:seed:query_tool_reverse:')
+
+
 def test_seed_resolve_invalid_profile_returns_400():
     client = _client()
     response = client.post(
@@ -122,6 +154,38 @@ def test_lineage_success_returns_forward_tree(mock_resolve_tree):
     assert payload['names']['CID-A'] == 'LOT-A'
 
 
+@patch('mes_dashboard.routes.trace_routes.LineageEngine.resolve_full_genealogy')
+def test_lineage_reverse_profile_returns_ancestors(mock_resolve_genealogy):
+    mock_resolve_genealogy.return_value = {
+        'ancestors': {'CID-SN': {'CID-A', 'CID-B'}},
+        'cid_to_name': {
+            'CID-SN': 'LOT-SN',
+            'CID-A': 'LOT-A',
+            'CID-B': 'LOT-B',
+        },
+        'parent_map': {'CID-SN': ['CID-A'], 'CID-A': ['CID-B']},
+        'merge_edges': {'CID-SN': ['CID-A']},
+    }
+
+    client = _client()
+    response = client.post(
+        '/api/trace/lineage',
+        json={
+            'profile': 'query_tool_reverse',
+            'container_ids': ['CID-SN'],
+        },
+    )
+
+    assert response.status_code == 200
+    payload = response.get_json()
+    assert payload['stage'] == 'lineage'
+    assert payload['roots'] == ['CID-SN']
+    assert sorted(payload['ancestors']['CID-SN']) == ['CID-A', 'CID-B']
+    assert payload['parent_map']['CID-SN'] == ['CID-A']
+    assert payload['merge_edges']['CID-SN'] == ['CID-A']
+    assert payload['names']['CID-A'] == 'LOT-A'
+
+
 @patch(
     'mes_dashboard.routes.trace_routes.LineageEngine.resolve_forward_tree',
     side_effect=TimeoutError('lineage timed out'),