diff --git a/inventory-web/src/views/bom/BomManage.vue b/inventory-web/src/views/bom/BomManage.vue
index 14b9f93..59448c6 100644
--- a/inventory-web/src/views/bom/BomManage.vue
+++ b/inventory-web/src/views/bom/BomManage.vue
@@ -164,7 +164,7 @@
 
         <el-table :data="filteredChildren" border style="width: 100%; margin-bottom: 15px" max-height="300">
           <el-table-column label="子件物料" min-width="250" v-if="hasFormFieldPermission('child_id')">
-            <template #default="{ row, $index }">
+            <template #default="{ row }">
               <!-- ====== 改造：子件下拉 - 远程搜索 + 懒加载 ====== -->
               <div style="display: flex; align-items: center; gap: 8px;">
                 <el-select
@@ -174,14 +174,14 @@
                     remote
                     reserve-keyword
                     style="flex: 1;"
-                    :remote-method="(q: string) => handleRemoteSearch(q, 'child', $index)"
+                    :remote-method="(q: string) => handleRemoteSearch(q, 'child', row.rowKey)"
                     :loading="selectLoading"
                     :loading-text="`正在加载第 ${childQueryParams.page} 页...`"
-                    :popper-class="`bom-loadmore-popper child-popper-${$index}`"
-                    @visible-change="(visible: boolean) => handleVisibleChange(visible, 'child', $index)"
+                    :popper-class="`bom-loadmore-popper child-popper-${row.rowKey}`"
+                    @visible-change="(visible: boolean) => handleVisibleChange(visible, 'child', row.rowKey)"
                 >
                   <el-option
-                      v-for="item in getChildOptions($index)"
+                      v-for="item in getChildOptions(row.rowKey)"
                       :key="item.id"
                       :label="`${item.name} (${item.spec})`"
                       :value="item.id"
@@ -197,7 +197,7 @@
                     type="primary"
                     link
                     :icon="EditPen"
-                    @click.stop="openMaterialInNewTab(row.child_id, getChildSpec($index))"
+                    @click.stop="openMaterialInNewTab(row.child_id, getChildSpec(row.rowKey))"
                     style="font-size: 16px; padding: 4px;"
                   />
                 </el-tooltip>
@@ -218,8 +218,8 @@
           </el-table-column>
 
           <el-table-column label="操作" width="60" align="center" v-if="userStore.hasPermission('bom_manage:operation')">
-            <template #default="{ $index }">
-              <el-button type="danger" link @click="removeChild($index)">删</el-button>
+            <template #default="{ row }">
+              <el-button type="danger" link @click="removeChild(row.rowKey)">删</el-button>
             </template>
           </el-table-column>
         </el-table>
@@ -266,6 +266,7 @@ interface MaterialBase {
   spec: string
 }
 interface ChildRow {
+  rowKey: number        // 唯一标识，替代 $index 作为 Map key
   child_id: number | null
   dosage: number
   remark: string
@@ -321,15 +322,15 @@ const getChildOptions = (index: number): MaterialBase[] => {
 // ============================================================
 const fetchMaterialOptions = async (
   type: 'parent' | 'child',
-  index?: number,
+  rowKey?: number,
   isLoadMore = false
 ) => {
-  // 子件行需要 index
-  if (type === 'child' && index === undefined) return
+  // 子件行需要 rowKey（唯一标识，不再依赖数组索引）
+  if (type === 'child' && rowKey === undefined) return
 
   const params = type === 'parent'
     ? parentQueryParams
-    : childDropdownStates.value.get(index!)?.queryParams
+    : childDropdownStates.value.get(rowKey!)?.queryParams
 
   if (!params) return
 
@@ -353,12 +354,19 @@ const fetchMaterialOptions = async (
           const newItems = list.filter(m => !existingIds.has(m.id))
           parentOptions.value.push(...newItems)
         } else {
-          parentOptions.value = list
+          // ★ 修复回显丢失：先检查当前选中项是否在列表中，不在则从原 options 保留
+          const selectedId = form.parent_id
+          let finalList = [...list]
+          if (selectedId && !list.find(m => m.id === selectedId)) {
+            const existing = parentOptions.value.find(m => m.id === selectedId)
+            if (existing) finalList.unshift(existing)
+          }
+          parentOptions.value = finalList
         }
         // 判断是否还有更多数据
         parentHasMore.value = parentOptions.value.length < total
       } else {
-        const state = childDropdownStates.value.get(index!)
+        const state = childDropdownStates.value.get(rowKey!)
         if (!state) return
 
         if (isLoadMore) {
@@ -366,7 +374,15 @@ const fetchMaterialOptions = async (
           const newItems = list.filter(m => !existingIds.has(m.id))
           state.options.push(...newItems)
         } else {
-          state.options = list
+          // ★ 修复回显丢失：先通过 rowKey 精准找到当前行，再检查选中项是否在列表中
+          const currentRow = form.children.find(c => c.rowKey === rowKey)
+          const currentSelectedId = currentRow?.child_id
+          let finalList = [...list]
+          if (currentSelectedId && !list.find(m => m.id === currentSelectedId)) {
+            const existing = state.options.find(m => m.id === currentSelectedId)
+            if (existing) finalList.unshift(existing)
+          }
+          state.options = finalList
         }
         state.hasMore = state.options.length < total
       }
@@ -384,27 +400,27 @@ const fetchMaterialOptions = async (
 const handleRemoteSearch = (
   query: string,
   type: 'parent' | 'child',
-  index?: number
+  rowKey?: number
 ) => {
   if (type === 'parent') {
     parentQueryParams.keyword = query
     parentQueryParams.page = 1
     parentHasMore.value = true
     fetchMaterialOptions('parent')
-  } else if (type === 'child' && index !== undefined) {
-    const state = childDropdownStates.value.get(index)
+  } else if (type === 'child' && rowKey !== undefined) {
+    const state = childDropdownStates.value.get(rowKey)
     if (!state) return
     state.queryParams.keyword = query
     state.queryParams.page = 1
     state.hasMore = true
-    fetchMaterialOptions('child', index)
+    fetchMaterialOptions('child', rowKey)
   }
 }
 
 // ============================================================
 // 【改造】下拉框展开/收起处理（重置分页 + 预加载第一页）
 // ============================================================
-const handleVisibleChange = (visible: boolean, type: 'parent' | 'child', index?: number) => {
+const handleVisibleChange = (visible: boolean, type: 'parent' | 'child', rowKey?: number) => {
   if (!visible) return
 
   if (type === 'parent') {
@@ -412,20 +428,20 @@ const handleVisibleChange = (visible: boolean, type: 'parent' | 'child', index?:
     parentQueryParams.keyword = ''
     parentHasMore.value = true
     fetchMaterialOptions('parent')
-  } else if (type === 'child' && index !== undefined) {
+  } else if (type === 'child' && rowKey !== undefined) {
     // 确保该行下拉状态已初始化
-    if (!childDropdownStates.value.has(index)) {
-      childDropdownStates.value.set(index, {
+    if (!childDropdownStates.value.has(rowKey)) {
+      childDropdownStates.value.set(rowKey, {
         options: [],
         queryParams: { page: 1, limit: PAGE_SIZE, keyword: '' },
         hasMore: true
       })
     }
-    const state = childDropdownStates.value.get(index)!
+    const state = childDropdownStates.value.get(rowKey)!
     state.queryParams.page = 1
     state.queryParams.keyword = ''
     state.hasMore = true
-    fetchMaterialOptions('child', index)
+    fetchMaterialOptions('child', rowKey)
   }
 
   // 延迟 50ms 等待弹窗 DOM 完全渲染
@@ -433,7 +449,7 @@ const handleVisibleChange = (visible: boolean, type: 'parent' | 'child', index?:
     // 动态拼接精确的选择器
     const exactSelector = type === 'parent'
       ? '.parent-popper .el-select-dropdown__wrap'
-      : `.child-popper-${index} .el-select-dropdown__wrap`;
+      : `.child-popper-${rowKey} .el-select-dropdown__wrap`;
 
     const popperWrap = document.querySelector(exactSelector) as HTMLElement;
 
@@ -450,9 +466,9 @@ const handleVisibleChange = (visible: boolean, type: 'parent' | 'child', index?:
         if (scrollHeight - scrollTop - clientHeight <= 10) {
           if (type === 'parent') {
             loadMoreParent();
-          } else if (type === 'child' && index !== undefined) {
+          } else if (type === 'child' && rowKey !== undefined) {
             // 触发子件加载
-            loadMoreChild(popperWrap, index);
+            loadMoreChild(popperWrap, rowKey);
           }
         }
       };
@@ -470,20 +486,20 @@ const loadMoreParent = () => {
   fetchMaterialOptions('parent', undefined, true)
 }
 
-const loadMoreChild = (_el: HTMLElement, index: number) => {
-  const state = childDropdownStates.value.get(index)
+const loadMoreChild = (_el: HTMLElement, rowKey: number) => {
+  const state = childDropdownStates.value.get(rowKey)
   if (!state) return
   if (selectLoading.value || !state.hasMore) return
   state.queryParams.page++
-  fetchMaterialOptions('child', index, true)
+  fetchMaterialOptions('child', rowKey, true)
 }
 
 // ============================================================
 // 【改造】初始化子件行下拉状态
 // ============================================================
-const initChildDropdownState = (index: number) => {
-  if (!childDropdownStates.value.has(index)) {
-    childDropdownStates.value.set(index, {
+const initChildDropdownState = (rowKey: number) => {
+  if (!childDropdownStates.value.has(rowKey)) {
+    childDropdownStates.value.set(rowKey, {
       options: [],
       queryParams: { page: 1, limit: PAGE_SIZE, keyword: '' },
       hasMore: true
@@ -500,7 +516,7 @@ const filteredChildren = computed(() => {
   }
   const kw = childSearchKeyword.value.toLowerCase()
   return form.children.filter(child => {
-    const state = childDropdownStates.value.get(form.children.indexOf(child))
+    const state = childDropdownStates.value.get(child.rowKey)
     const material = state?.options.find(m => m.id === child.child_id)
     if (!material) return false
     const name = (material.name || '').toLowerCase()
@@ -510,10 +526,11 @@ const filteredChildren = computed(() => {
 })
 
 // 获取子件规格（从 childDropdownStates 缓存中查找）
-const getChildSpec = (index: number): string => {
-  const state = childDropdownStates.value.get(index)
-  if (!state || !form.children[index]?.child_id) return ''
-  const material = state.options.find((m: MaterialBase) => m.id === form.children[index].child_id)
+const getChildSpec = (rowKey: number): string => {
+  const state = childDropdownStates.value.get(rowKey)
+  const row = form.children.find(c => c.rowKey === rowKey)
+  if (!state || !row?.child_id) return ''
+  const material = state.options.find((m: MaterialBase) => m.id === row.child_id)
   return material?.spec || ''
 }
 
@@ -677,8 +694,9 @@ const loadDetail = async (bomNo: string, version: string) => {
     const res = await getBomDetail(bomNo, version)
     if (res.code === 200) {
       const data = res.data
-      // 1. 映射子件基本数据
-      form.children = data.children.map((child: any) => ({
+      // 1. 映射子件基本数据（使用 idx 生成唯一 rowKey）
+      form.children = data.children.map((child: any, idx: number) => ({
+        rowKey: idx,  // 用数组索引作为唯一标识（编辑场景下不会增删行）
         child_id: child.child_id,
         dosage: child.dosage,
         remark: child.remark || ''
@@ -686,7 +704,7 @@ const loadDetail = async (bomNo: string, version: string) => {
 
       // 2. 初始化子件下拉状态，并预填充 options 解决回显显示 ID 的问题
       form.children.forEach((child, idx) => {
-        initChildDropdownState(idx)
+        initChildDropdownState(idx)  // rowKey === idx（编辑场景下唯一）
 
         if (child.child_id) {
           const state = childDropdownStates.value.get(idx)!
@@ -755,26 +773,17 @@ const resetForm = () => {
 }
 
 const addChild = () => {
-  const idx = form.children.length
-  form.children.push({ child_id: null, dosage: 0, remark: '' })
-  initChildDropdownState(idx)
+  const rowKey = Date.now() // 生成唯一标识，不再使用数组长度
+  form.children.push({ rowKey, child_id: null, dosage: 0, remark: '' })
+  initChildDropdownState(rowKey)
 }
 
-const removeChild = (idx: number) => {
-  form.children.splice(idx, 1)
-  // 清理该行下拉状态（需要重新索引后续行的状态）
-  rebuildChildDropdownStates()
-}
-
-// 重建子件下拉状态索引（删除行后需要重新编号）
-const rebuildChildDropdownStates = () => {
-  const newMap = new Map<number, ChildDropdownState>()
-  form.children.forEach((_, idx) => {
-    if (childDropdownStates.value.has(idx)) {
-      newMap.set(idx, childDropdownStates.value.get(idx)!)
-    }
-  })
-  childDropdownStates.value = newMap
+const removeChild = (rowKey: number) => {
+  // 通过 rowKey 找到并删除该行（不再依赖数组索引）
+  const idx = form.children.findIndex(c => c.rowKey === rowKey)
+  if (idx !== -1) form.children.splice(idx, 1)
+  // 直接删除该行的下拉状态（无需重建索引）
+  childDropdownStates.value.delete(rowKey)
 }
 
 const submitForm = async () => {