diff --git a/fund-mobile/src/api/index.ts b/fund-mobile/src/api/index.ts
index 5ffd08b..4dd61fe 100644
--- a/fund-mobile/src/api/index.ts
+++ b/fund-mobile/src/api/index.ts
@@ -23,6 +23,30 @@ export function updatePassword(data: { oldPassword: string; newPassword: string;
   return request.put('/sys/profile/password', data)
 }
 
+// ===================== 文件管理 =====================
+
+export function uploadFile(file: File, businessType?: string, businessId?: number, description?: string) {
+  const formData = new FormData()
+  formData.append('file', file)
+  if (businessType) formData.append('businessType', businessType)
+  if (businessId) formData.append('businessId', String(businessId))
+  if (description) formData.append('description', description)
+  
+  return request.post('/file/upload', formData, {
+    headers: {
+      'Content-Type': 'multipart/form-data'
+    }
+  })
+}
+
+export function getFileList(params?: { pageNum: number; pageSize: number; businessType?: string; businessId?: number; fileType?: string }) {
+  return request.get('/file/page', { params })
+}
+
+export function deleteFile(id: number) {
+  return request.delete(`/file/${id}`)
+}
+
 // ===================== 项目管理 =====================
 
 export function getProjectList(params?: { pageNum: number; pageSize: number; keyword?: string }) {
diff --git a/fund-mobile/src/views/expense/Add.vue b/fund-mobile/src/views/expense/Add.vue
index 3ae272e..867964e 100644
--- a/fund-mobile/src/views/expense/Add.vue
+++ b/fund-mobile/src/views/expense/Add.vue
@@ -87,14 +87,14 @@
 import { ref, reactive, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { showToast, showSuccessToast, showFailToast, ImagePreview } from 'vant'
-import { createExpense, getExpenseTypeTree } from '@/api'
+import { createExpense, getExpenseTypeTree, uploadFile } from '@/api'
 
 const router = useRouter()
 const loading = ref(false)
 const showTypePicker = ref(false)
 const showDatePicker = ref(false)
 const fileList = ref<any[]>([])
-const uploadedAttachments = ref<string[]>([])
+const uploadedAttachments = ref<string[]>([]) // 存储 COS 返回的文件路径
 
 const form = reactive({
   title: '',
@@ -120,22 +120,29 @@ const onDateConfirm = ({ selectedValues }: any) => {
   showDatePicker.value = false
 }
 
-// 附件上传处理
+// 附件上传处理 - 使用 COS 上传
 const onAfterRead = async (file: any) => {
-  // 这里模拟上传，实际应该调用文件上传 API
-  // 由于项目使用 fund-file 服务，暂时先保存为 base64
-  if (file.file) {
-    const reader = new FileReader()
-    reader.onload = (e) => {
-      const base64 = e.target?.result as string
-      // 提取 base64 数据部分（去掉 data:image/jpeg;base64,前缀）
-      const base64Data = base64.split(',')[1]
-      if (base64Data) {
-        uploadedAttachments.value.push(base64Data)
-        console.log('已添加附件:', base64Data.substring(0, 50) + '...')
-      }
+  if (!file.file) return
+  
+  try {
+    // 显示上传提示
+    showToast('上传中...')
+    
+    // 调用 uploadFile API 上传到 COS
+    const res: any = await uploadFile(file.file, 'expense', undefined, '支出附件')
+    
+    // 从响应中获取文件路径
+    const filePath = res.data?.filePath || res.data?.url
+    if (filePath) {
+      uploadedAttachments.value.push(filePath)
+      console.log('文件上传成功:', filePath)
+      showSuccessToast('上传成功')
+    } else {
+      showFailToast('上传失败：未获取文件路径')
     }
-    reader.readAsDataURL(file.file)
+  } catch (error: any) {
+    console.error('上传失败:', error)
+    showFailToast(error.message || '上传失败')
   }
 }
 
@@ -145,10 +152,12 @@ const onBeforeDelete = (file: any, detail: any) => {
   return true
 }
 
-// 预览图片
+// 预览图片（通过后端下载 URL）
 const onPreviewImage = (index: number) => {
+  // 这里需要后端提供文件预览或下载接口
+  // 暂时使用后端返回的完整 URL
   ImagePreview.show({
-    images: uploadedAttachments.value.map(b64 => `data:image/jpeg;base64,${b64}`),
+    images: uploadedAttachments.value,
     startPosition: index,
   })
 }
@@ -176,7 +185,7 @@ const handleSubmit = async () => {
     // 转换日期格式为 LocalDateTime 格式
     const expenseDateTime = form.expenseDate ? `${form.expenseDate}T12:00:00` : null
     
-    // 处理附件：将 base64 数组转为逗号分隔的字符串
+    // 处理附件：将 COS 文件路径数组转为逗号分隔的字符串
     const attachmentsStr = uploadedAttachments.value.length > 0 
       ? uploadedAttachments.value.join(',') 
       : null