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/UpdateFilesDialog.vue b/src/views/purchase/purchasingrequisition/UpdateFilesDialog.vue
new file mode 100644
index 0000000..61e4934
--- /dev/null
+++ b/src/views/purchase/purchasingrequisition/UpdateFilesDialog.vue
@@ -0,0 +1,181 @@
+<template>
+  <el-dialog
+    v-model="visible"
+    title="更新材料"
+    width="900px"
+    destroy-on-close
+    append-to-body
+    :close-on-click-modal="false"
+  >
+    <template #header>
+      <div class="dialog-header">
+        <span class="dialog-title">
+          <el-icon><Upload /></el-icon>
+          更新材料 - {{ purchaseNo || purchaseId }}
+        </span>
+      </div>
+    </template>
+
+    <el-alert
+      title="仅支持上传PDF格式文件，上传新文件将替换原有同类型文件"
+      type="info"
+      :closable="false"
+      style="margin-bottom: 16px"
+    />
+
+    <el-form label-width="120px">
+      <el-form-item label="采购编号">
+        <el-input v-model="purchaseNo" disabled />
+      </el-form-item>
+
+      <el-form-item
+        v-for="item in fileTypeList"
+        :key="item.value"
+        :label="item.label"
+      >
+        <upload-file
+          v-model="fileMap[item.value]"
+          :limit="5"
+          :file-type="['pdf']"
+          :data="{ fileType: item.value, purchaseId: purchaseId }"
+          upload-file-url="/purchase/purchasingfiles/upload"
+          @success="(res) => handleUploadSuccess(res, item.value)"
+        />
+        <div class="file-tips">{{ item.desc }}</div>
+      </el-form-item>
+    </el-form>
+
+    <template #footer>
+      <el-button @click="visible = false">取消</el-button>
+      <el-button type="primary" :loading="submitting" @click="handleSubmit">
+        确认更新
+      </el-button>
+    </template>
+  </el-dialog>
+</template>
+
+<script setup lang="ts">
+import { ref, reactive } from 'vue'
+import { Upload } from '@element-plus/icons-vue'
+import { useMessage } from '/@/hooks/message'
+import { updateFiles } from '/@/api/purchase/purchasingrequisition'
+
+interface FileItem {
+  id: string
+  name: string
+  url: string
+}
+
+interface FileTypeItem {
+  value: string
+  label: string
+  desc: string
+}
+
+const visible = ref(false)
+const submitting = ref(false)
+const purchaseId = ref('')
+const purchaseNo = ref('')
+
+const fileMap = reactive<Record<string, FileItem[]>>({})
+
+const fileTypeList: FileTypeItem[] = [
+  { value: '10', label: '商务洽谈纪要', desc: '商务洽谈相关纪要文件' },
+  { value: '20', label: '市场采购纪要', desc: '市场采购相关纪要文件' },
+  { value: '30', label: '网上商城采购材料', desc: '网上商城采购相关材料' },
+  { value: '40', label: '可行性论证报告', desc: '项目可行性论证报告' },
+  { value: '50', label: '会议记录', desc: '相关会议记录文件' },
+  { value: '60', label: '其他材料', desc: '其他相关材料' },
+  { value: '70', label: '单一来源专家论证表', desc: '单一来源采购专家论证表' },
+  { value: '80', label: '进口产品申请表', desc: '进口产品申请相关表格' },
+  { value: '90', label: '进口产品专家论证表', desc: '进口产品专家论证表' },
+  { value: '100', label: '政府采购意向表', desc: '政府采购意向公示表' },
+  { value: '110', label: '履约验收单', desc: '履约验收相关单据' },
+  { value: '120', label: '采购需求表', desc: '采购需求明细表' },
+]
+
+const open = (id: string, no?: string) => {
+  purchaseId.value = id || ''
+  purchaseNo.value = no || ''
+  visible.value = true
+  // 清空文件列表
+  fileTypeList.forEach((item) => {
+    fileMap[item.value] = []
+  })
+}
+
+const handleUploadSuccess = (res: any, fileType: string) => {
+  if (res && res.data) {
+    useMessage().success('上传成功')
+  }
+}
+
+const handleSubmit = async () => {
+  if (!purchaseId.value) {
+    useMessage().warning('无法获取采购申请ID')
+    return
+  }
+
+  // 收集所有上传的文件ID
+  const allFileIds: string[] = []
+  fileTypeList.forEach((item) => {
+    const files = fileMap[item.value] || []
+    files.forEach((file) => {
+      if (file.id) {
+        allFileIds.push(file.id)
+      }
+    })
+  })
+
+  if (allFileIds.length === 0) {
+    useMessage().warning('请至少上传一个文件')
+    return
+  }
+
+  submitting.value = true
+  try {
+    await updateFiles({
+      purchaseId: purchaseId.value,
+      fileIds: allFileIds,
+    })
+    useMessage().success('更新材料成功')
+    visible.value = false
+    emit('refresh')
+  } catch (err: any) {
+    useMessage().error(err?.msg || '更新材料失败')
+  } finally {
+    submitting.value = false
+  }
+}
+
+const emit = defineEmits<{
+  (e: 'refresh'): void
+}>()
+
+defineExpose({
+  open,
+})
+</script>
+
+<style scoped lang="scss">
+.dialog-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  width: 100%;
+}
+
+.dialog-title {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 16px;
+  font-weight: 500;
+}
+
+.file-tips {
+  font-size: 12px;
+  color: #909399;
+  margin-top: 4px;
+}
+</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;
   }
 };