diff --git a/src/api/purchase/purchasingrequisition.ts b/src/api/purchase/purchasingrequisition.ts
index bef29cb..5f78f36 100644
--- a/src/api/purchase/purchasingrequisition.ts
+++ b/src/api/purchase/purchasingrequisition.ts
@@ -359,3 +359,15 @@ export function listDownloadUrls(purchaseId: string | number) {
 	});
 }
 
+/**
+ * 更新采购材料（部门申请人或负责人重新上传文件）
+ * @param data 包含purchaseId和fileIds的对象
+ */
+export function updateFiles(data: { purchaseId: string; fileIds: string[] }) {
+	return request({
+		url: '/purchase/purchasingfiles/updateFiles',
+		method: 'post',
+		data
+	});
+}
+
diff --git a/src/views/purchase/purchasingrequisition/FileArchiveDialog.vue b/src/views/purchase/purchasingrequisition/FileArchiveDialog.vue
index 6d36e4c..6d6e05d 100644
--- a/src/views/purchase/purchasingrequisition/FileArchiveDialog.vue
+++ b/src/views/purchase/purchasingrequisition/FileArchiveDialog.vue
@@ -32,7 +32,7 @@
       class="file-table"
     >
       <el-table-column type="index" label="序号" width="60" align="center" />
-      <el-table-column prop="fileTitle" label="文件名称" min-width="250" show-overflow-tooltip>
+      <el-table-column prop="fileTitle" label="文件名称" min-width="220" show-overflow-tooltip>
         <template #default="{ row }">
           <div class="file-name">
             <el-icon class="file-icon"><Document /></el-icon>
@@ -40,13 +40,21 @@
           </div>
         </template>
       </el-table-column>
-      <el-table-column prop="fileTypeDesc" label="文件类型" width="180" align="center">
+      <el-table-column prop="fileTypeDesc" label="文件类型" width="160" align="center">
         <template #default="{ row }">
           <el-tag type="info">{{ row.fileTypeDesc || '未知类型' }}</el-tag>
         </template>
       </el-table-column>
-      <el-table-column label="操作" width="100" align="center" fixed="right">
+      <el-table-column label="操作" width="150" align="center" fixed="right">
         <template #default="{ row }">
+          <el-button
+            type="primary"
+            link
+            icon="View"
+            @click="handlePreview(row)"
+          >
+            预览
+          </el-button>
           <el-button
             type="primary"
             link
@@ -67,6 +75,26 @@
       <el-button @click="visible = false">关闭</el-button>
     </template>
   </el-dialog>
+
+  <!-- PDF预览弹窗 -->
+  <el-dialog
+    v-model="previewVisible"
+    title="文件预览"
+    width="90%"
+    top="5vh"
+    destroy-on-close
+    append-to-body
+    class="preview-dialog"
+  >
+    <div class="preview-container">
+      <iframe
+        v-if="previewUrl"
+        :src="previewUrl"
+        class="preview-iframe"
+        frameborder="0"
+      />
+    </div>
+  </el-dialog>
 </template>
 
 <script setup lang="ts">
@@ -87,6 +115,8 @@ interface FileItem {
 const visible = ref(false)
 const loading = ref(false)
 const downloading = ref(false)
+const previewVisible = ref(false)
+const previewUrl = ref('')
 const purchaseId = ref('')
 const purchaseNo = ref('')
 const fileList = ref<FileItem[]>([])
@@ -119,6 +149,29 @@ const loadFileList = async () => {
   }
 }
 
+const isPdfFile = (fileName: string): boolean => {
+  if (!fileName) return false
+  const ext = fileName.toLowerCase().split('.').pop()
+  return ext === 'pdf'
+}
+
+const handlePreview = (row: FileItem) => {
+  if (!row.downloadUrl) {
+    useMessage().warning('文件预览地址不存在')
+    return
+  }
+
+  if (!isPdfFile(row.fileTitle)) {
+    useMessage().info('仅支持PDF格式文件预览，将为您下载文件')
+    handleDownloadFile(row)
+    return
+  }
+
+  // 使用iframe预览PDF（通过后端下载接口获取文件流）
+  previewUrl.value = row.downloadUrl
+  previewVisible.value = true
+}
+
 const handleDownloadFile = (row: FileItem) => {
   if (row.downloadUrl) {
     window.open(row.downloadUrl, '_blank')
@@ -182,4 +235,14 @@ defineExpose({
 .empty-tip {
   padding: 40px 0;
 }
-</style>
\ No newline at end of file
+
+.preview-container {
+  width: 100%;
+  height: calc(90vh - 120px);
+}
+
+.preview-iframe {
+  width: 100%;
+  height: 100%;
+}
+</style>
diff --git a/src/views/purchase/purchasingrequisition/index.vue b/src/views/purchase/purchasingrequisition/index.vue
index 3a13a3a..607bf27 100644
--- a/src/views/purchase/purchasingrequisition/index.vue
+++ b/src/views/purchase/purchasingrequisition/index.vue
@@ -295,6 +295,9 @@
     <!-- 文件归档弹窗 -->
     <FileArchiveDialog ref="fileArchiveDialogRef" />
 
+    <!-- 更新材料弹窗 -->
+    <UpdateFilesDialog ref="updateFilesDialogRef" @refresh="getDataList" />
+
     <!-- 招标文件审核弹窗 -->
 <!--    <DocAuditDialog ref="docAuditDialogRef" @refresh="getDataList" />-->
 
@@ -348,12 +351,12 @@
 import { ref, reactive, defineAsyncComponent, onMounted, computed } from 'vue'
 import { useRouter } from 'vue-router'
 import { BasicTableProps, useTable } from "/@/hooks/table";
-import { getPage, delObj, submitObj, getApplyTemplateDownloadUrl, getFileApplyTemplateDownloadUrl, getDeptMembers, saveRepresentor, listDownloadUrls } from "/@/api/purchase/purchasingrequisition";
+import { getPage, delObj, submitObj, getApplyTemplateDownloadUrl, getFileApplyTemplateDownloadUrl, getDeptMembers, saveRepresentor, listDownloadUrls, updateFiles } from "/@/api/purchase/purchasingrequisition";
 import { useMessage, useMessageBox } from "/@/hooks/message";
 import { useAuth } from '/@/hooks/auth';
 import { getDicts } from '/@/api/admin/dict';
 import { getTree } from '/@/api/purchase/purchasingcategory';
-import { List, Document, DocumentCopy, Search, Money, CircleCheck, InfoFilled, Calendar, OfficeBuilding, Warning, DocumentChecked, Edit, Delete, Upload, FolderOpened, Download, User } from '@element-plus/icons-vue'
+import { List, Document, DocumentCopy, Search, Money, CircleCheck, InfoFilled, Calendar, OfficeBuilding, Warning, DocumentChecked, Edit, Delete, Upload, FolderOpened, Download, User, RefreshRight } from '@element-plus/icons-vue'
 import other from '/@/utils/other'
 import { Session } from '/@/utils/storage'
 
@@ -369,6 +372,7 @@ const ActionDropdown = defineAsyncComponent(() => import('/@/components/tools/ac
 const PurchasingAcceptModal = defineAsyncComponent(() => import('./accept/PurchasingAcceptModal.vue'));
 const FlowCommentTimeline = defineAsyncComponent(() => import('/@/views/jsonflow/comment/timeline.vue'));
 const FileArchiveDialog = defineAsyncComponent(() => import('./FileArchiveDialog.vue'));
+const UpdateFilesDialog = defineAsyncComponent(() => import('./UpdateFilesDialog.vue'));
 // const DocAuditDialog = defineAsyncComponent(() => import('./docAudit/DocAuditDialog.vue'));
 
 // 字典数据和品目树数据
@@ -398,6 +402,7 @@ const currFlowCommentType = ref<'apply' | 'file'>('apply')
 
 const implementFormRef = ref()
 const fileArchiveDialogRef = ref()
+const updateFilesDialogRef = ref()
 
 /** 采购代表弹窗 */
 const representorDialogVisible = ref(false)
@@ -636,6 +641,12 @@ const getActionMenuItems = (row: any) => {
       icon: User,
       visible: () => isDeptAuditRole.value,
     },
+    {
+      command: 'updateFiles',
+      label: '更新材料',
+      icon: RefreshRight,
+      visible: () => isCompleted && hasAuth('purchase_purchasingapply_edit'),
+    },
     // {
     //   command: 'downloadFileApply',
     //   label: '下载文件审批表',
@@ -691,6 +702,9 @@ const handleMoreCommand = (command: string, row: any) => {
     case 'representor':
       openRepresentorDialog(row);
       break;
+    case 'updateFiles':
+      handleUpdateFiles(row);
+      break;
   }
 };