diff --git a/inventory-web/src/views/bom/BomManage.vue b/inventory-web/src/views/bom/BomManage.vue
index 2f42584..346d461 100644
--- a/inventory-web/src/views/bom/BomManage.vue
+++ b/inventory-web/src/views/bom/BomManage.vue
@@ -63,7 +63,7 @@
       </div>
     </el-card>
 
-    <el-dialog v-model="dialogVisible" :title="dialogTitle" width="850px" destroy-on-close :close-on-click-modal="false">
+    <el-dialog v-model="dialogVisible" :title="dialogTitle" width="850px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-form :model="form" label-width="120px" ref="formRef" :rules="rules">
 
         <el-row :gutter="20">
@@ -75,13 +75,14 @@
                   placeholder="请搜索并选择父件"
                   filterable
                   remote
-                  reserve-keyword
+                  reserve-keyword="true"
                   :remote-method="(q: string) => handleRemoteSearch(q, 'parent')"
                   :loading="selectLoading"
                   style="width: 100%"
                   :disabled="isReadOnlyMode || isEditMode"
                   class="beautified-select"
                   popper-class="bom-loadmore-popper parent-popper"
+                  default-first-option="true"
                   @visible-change="(visible: boolean) => handleVisibleChange(visible, 'parent')"
                   @change="onParentChange"
               >
@@ -172,13 +173,14 @@
                     placeholder="请搜索原料"
                     filterable
                     remote
-                    reserve-keyword
+                    reserve-keyword="true"
                     style="flex: 1;"
                     :remote-method="(q: string) => handleRemoteSearch(q, 'child', row.rowKey)"
                     :loading="selectLoading"
                     :loading-text="`正在加载第 ${childQueryParams.page} 页...`"
                     :popper-class="`bom-loadmore-popper child-popper-${row.rowKey}`"
                     :disabled="isReadOnlyMode"
+                    default-first-option="true"
                     @visible-change="(visible: boolean) => handleVisibleChange(visible, 'child', row.rowKey)"
                 >
                   <el-option
@@ -413,15 +415,18 @@ const handleRemoteSearch = (
   type: 'parent' | 'child',
   rowKey?: number
 ) => {
+  // 防御性处理：粘贴场景常混入零宽字符 / 控制字符 / 不可见 Unicode
+  const rawQuery = String(query || '')
+  const safeQuery = rawQuery.replace(/[\x00-\x1F\x7F-\x9F\u200B-\u200D\uFEFF]/g, '').trim()
   if (type === 'parent') {
-    parentQueryParams.keyword = query
+    parentQueryParams.keyword = safeQuery
     parentQueryParams.page = 1
     parentHasMore.value = true
     fetchMaterialOptions('parent')
   } else if (type === 'child' && rowKey !== undefined) {
     const state = childDropdownStates.value.get(rowKey)
     if (!state) return
-    state.queryParams.keyword = query
+    state.queryParams.keyword = safeQuery
     state.queryParams.page = 1
     state.hasMore = true
     fetchMaterialOptions('child', rowKey)
@@ -435,6 +440,10 @@ const handleVisibleChange = (visible: boolean, type: 'parent' | 'child', rowKey?
   if (!visible) return
 
   if (type === 'parent') {
+    // 防御性拦截：竞态条件守卫
+    // 如果当前已经有搜索关键字（例如用户刚刚粘贴了内容、remote-method 已经设置了 keyword），
+    // 绝对不要去请求默认列表，否则会清空 keyword、覆盖正确结果。
+    if (parentQueryParams.keyword || parentOptions.value.length > 0) return
     parentQueryParams.page = 1
     parentQueryParams.keyword = ''
     parentHasMore.value = true
@@ -449,6 +458,8 @@ const handleVisibleChange = (visible: boolean, type: 'parent' | 'child', rowKey?
       })
     }
     const state = childDropdownStates.value.get(rowKey)!
+    // 防御性拦截：竞态条件守卫（同上）
+    if (state.queryParams.keyword || state.options.length > 0) return
     state.queryParams.page = 1
     state.queryParams.keyword = ''
     state.hasMore = true
diff --git a/inventory-web/src/views/purchase/index.vue b/inventory-web/src/views/purchase/index.vue
index de83970..e606891 100644
--- a/inventory-web/src/views/purchase/index.vue
+++ b/inventory-web/src/views/purchase/index.vue
@@ -64,7 +64,7 @@
     />
 
     <!-- ========== 新建/编辑弹窗 ========== -->
-    <el-dialog v-model="formDialogVisible" :title="dialogTitle" width="700px" destroy-on-close :close-on-click-modal="false">
+    <el-dialog v-model="formDialogVisible" :title="dialogTitle" width="700px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-form ref="formRef" :model="form" label-width="110px">
 
         <el-row :gutter="20">
@@ -74,14 +74,14 @@
                   v-model="materialBaseId"
                   filterable
                   remote
-                  reserve-keyword
+                  reserve-keyword="true"
                   clearable
                   placeholder="输入名称或规格搜索..."
                   :remote-method="handleSearchMaterialDebounced"
                   :loading="searchLoading"
                   style="width: 100%"
                   @change="onMaterialSelected"
-                  default-first-option
+                  default-first-option="true"
                   popper-class="long-dropdown"
                   v-loadmore="handleLoadMoreMaterials"
                   @visible-change="onMaterialDropdownVisibleChange"
@@ -171,7 +171,7 @@
     </el-dialog>
 
     <!-- ========== 详情弹窗 ========== -->
-    <el-dialog v-model="detailDialogVisible" title="采购申请详情" width="700px" destroy-on-close>
+    <el-dialog v-model="detailDialogVisible" title="采购申请详情" width="700px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-descriptions :column="2" border>
         <el-descriptions-item label="申请单号">{{ detail.request_no }}</el-descriptions-item>
         <el-descriptions-item label="状态">
@@ -215,7 +215,7 @@
     </el-dialog>
 
     <!-- ========== 驳回原因弹窗 ========== -->
-    <el-dialog v-model="rejectDialogVisible" title="驳回申请" width="480px" destroy-on-close>
+    <el-dialog v-model="rejectDialogVisible" title="驳回申请" width="480px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-form label-width="80px">
         <el-form-item label="申请单号">
           <span style="font-weight: bold; color: #409EFF;">{{ currentRejectRow?.request_no }}</span>
@@ -396,14 +396,17 @@ const handleSearchMaterialDebounced = (query: string) => {
 }
 
 const handleSearchMaterial = async (query: string) => {
+  // 防御性处理：粘贴场景常混入零宽字符 / 控制字符 / 不可见 Unicode
+  const rawQuery = String(query || '')
+  const safeQuery = rawQuery.replace(/[\x00-\x1F\x7F-\x9F\u200B-\u200D\uFEFF]/g, '').trim()
   searchLoading.value = true
-  searchKeyword.value = query
+  searchKeyword.value = safeQuery
   searchPage.value = 1
   materialOptions.value = []
   hasNextPage.value = true
 
   try {
-    const res: any = await searchMaterialPurchase(query, 1)
+    const res: any = await searchMaterialPurchase(safeQuery, 1)
     materialOptions.value = res.data || []
     hasNextPage.value = res.has_next !== false
   } finally {
@@ -431,9 +434,14 @@ const handleLoadMoreMaterials = async () => {
 }
 
 const onMaterialDropdownVisibleChange = (visible: boolean) => {
-  if (visible && materialOptions.value.length === 0) {
-    handleSearchMaterial('')
-  }
+  if (!visible) return
+  // 防御性拦截：竞态条件守卫
+  // 如果当前已经有搜索关键字（例如用户刚刚粘贴了内容、remote-method 已经设置了 searchKeyword），
+  // 绝对不要去请求默认列表，否则会清空 searchKeyword、覆盖正确结果。
+  if (searchKeyword.value || materialOptions.value.length > 0) return
+  // 打断正在排队的 debounce 定时器，避免与默认请求相互打架
+  if (searchTimer) { clearTimeout(searchTimer); searchTimer = null }
+  handleSearchMaterial('')
 }
 
 const onMaterialSelected = (id: number | null) => {
diff --git a/inventory-web/src/views/stock/inbound/buy.vue b/inventory-web/src/views/stock/inbound/buy.vue
index baba795..9893ae7 100644
--- a/inventory-web/src/views/stock/inbound/buy.vue
+++ b/inventory-web/src/views/stock/inbound/buy.vue
@@ -298,7 +298,7 @@
                         v-model="form.base_id"
                         filterable
                         remote
-                        reserve-keyword
+                        reserve-keyword="true"
                         clearable
                         placeholder="请输入名称或规格进行检索..."
                         :remote-method="handleSearchMaterialDebounced"
@@ -306,7 +306,7 @@
                         :loading="searchLoading"
                         style="width: 100%"
                         @change="onMaterialSelected"
-                        default-first-option
+                        default-first-option="true"
                         v-loadmore="loadMoreMaterials"
                         popper-class="long-dropdown"
                     >
@@ -651,8 +651,8 @@
       </template>
     </el-dialog>
 
-    <el-dialog v-model="dialogVisibleImage" append-to-body width="50%"><img style="width: 100%" :src="dialogImageUrl" alt="Preview Image" /></el-dialog>
-    <el-dialog v-model="cameraDialogVisible" title="拍照上传" width="500px" append-to-body destroy-on-close :close-on-click-modal="false">
+    <el-dialog v-model="dialogVisibleImage" append-to-body width="50%" :close-on-click-modal="false" :close-on-press-escape="false"><img style="width: 100%" :src="dialogImageUrl" alt="Preview Image" /></el-dialog>
+    <el-dialog v-model="cameraDialogVisible" title="拍照上传" width="500px" append-to-body destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <WebRtcCamera
           ref="cameraRef"
           @photo-submit="handleCameraConfirm"
@@ -660,7 +660,7 @@
       />
     </el-dialog>
 
-    <el-dialog v-model="printVisible" title="标签打印预览" width="400px" destroy-on-close append-to-body>
+    <el-dialog v-model="printVisible" title="标签打印预览" width="400px" destroy-on-close append-to-body :close-on-click-modal="false" :close-on-press-escape="false">
       <div style="text-align: center;">
         <div v-loading="printLoading" class="preview-box">
           <img v-if="previewUrl" :src="previewUrl" alt="Label Preview" style="width: 100%; border: 1px solid #ccc;"/>
@@ -1136,7 +1136,16 @@ const querySearchCurrency = (queryString: string, cb: any) => {
   cb(filtered)
 }
 
-const handleMaterialDropdownVisible = (visible: boolean) => { if (visible && materialOptions.value.length === 0) handleSearchMaterialDebounced('') }
+const handleMaterialDropdownVisible = (visible: boolean) => {
+  if (!visible) return
+  // 防御性拦截：竞态条件守卫
+  // 如果当前已经有搜索关键字（例如用户刚刚粘贴了内容、remote-method 已经设置了 searchKeyword），
+  // 绝对不要去请求默认列表，否则会清空 searchKeyword、覆盖正确结果。
+  if (searchKeyword.value || materialOptions.value.length > 0) return
+  // 打断正在排队的 debounce 定时器，避免与默认请求相互打架
+  if (searchTimer) { clearTimeout(searchTimer); searchTimer = null }
+  handleSearchMaterial('')
+}
 
 const handleSearchMaterialDebounced = (query: string) => {
   if (searchTimer) clearTimeout(searchTimer)
@@ -1146,13 +1155,16 @@ const handleSearchMaterialDebounced = (query: string) => {
 }
 
 const handleSearchMaterial = async (query: string) => {
+  // 防御性处理：粘贴场景常混入零宽字符 / 控制字符 / 不可见 Unicode
+  const rawQuery = String(query || '')
+  const safeQuery = rawQuery.replace(/[\x00-\x1F\x7F-\x9F\u200B-\u200D\uFEFF]/g, '').trim()
   searchLoading.value = true
-  searchKeyword.value = query
+  searchKeyword.value = safeQuery
   searchPage.value = 1
   materialOptions.value = []
 
   try {
-    const res: any = await searchMaterialBase(query, 1)
+    const res: any = await searchMaterialBase(safeQuery, 1)
     if (res.data) {
       const apiResults = (res.data || []).map((i: any) => ({...i, isHistory: false}))
       materialOptions.value = apiResults
diff --git a/inventory-web/src/views/stock/inbound/service.vue b/inventory-web/src/views/stock/inbound/service.vue
index dd8560c..801a69a 100644
--- a/inventory-web/src/views/stock/inbound/service.vue
+++ b/inventory-web/src/views/stock/inbound/service.vue
@@ -85,6 +85,8 @@
       :title="dialogTitle"
       width="700px"
       destroy-on-close
+      :close-on-click-modal="false"
+      :close-on-press-escape="false"
       @close="resetDialog"
     >
       <el-form ref="formRef" :model="form" :rules="rules" label-width="100px">
@@ -103,14 +105,14 @@
                         v-model="form.base_id"
                         filterable
                         remote
-                        reserve-keyword
+                        reserve-keyword="true"
                         placeholder="输入名称或规格..."
                         :remote-method="handleSearchMaterial"
                         @visible-change="handleMaterialDropdownVisible"
                         :loading="searchLoading"
                         style="width: 100%"
                         @change="onMaterialSelected"
-                        default-first-option
+                        default-first-option="true"
                     >
                       <el-option
                           v-for="item in materialOptions"
@@ -269,6 +271,7 @@ const perPage = ref(20)
 const total = ref(0)
 
 const materialOptions = ref<any[]>([])
+const searchKeyword = ref('')
 const searchLoading = ref(false)
 
 const searchForm = reactive({
@@ -329,15 +332,22 @@ const handlePageChange = (val: number) => {
 }
 
 const handleMaterialDropdownVisible = (visible: boolean) => {
-  if (visible && materialOptions.value.length === 0) {
-    handleSearchMaterial('')
-  }
+  if (!visible) return
+  // 防御性拦截：竞态条件守卫
+  // 如果当前已经有搜索关键字（例如用户刚刚粘贴了内容、remote-method 已经设置了 searchKeyword），
+  // 绝对不要去请求默认列表，否则会清空 searchKeyword、覆盖正确结果。
+  if (searchKeyword.value || materialOptions.value.length > 0) return
+  handleSearchMaterial('')
 }
 
 const handleSearchMaterial = async (query: string) => {
+  // 防御性处理：粘贴场景常混入零宽字符 / 控制字符 / 不可见 Unicode
+  const rawQuery = String(query || '')
+  const safeQuery = rawQuery.replace(/[\x00-\x1F\x7F-\x9F\u200B-\u200D\uFEFF]/g, '').trim()
+  searchKeyword.value = safeQuery
   searchLoading.value = true
   try {
-    const res = await searchMaterialBase(query)
+    const res = await searchMaterialBase(safeQuery)
     if (res.code === 200) {
       const apiResults = (res.data || []).map((i: any) => ({ ...i, isHistory: false }))
       materialOptions.value = apiResults