diff --git a/backend/config/settings.py b/backend/config/settings.py
index fb4a058..d7cd9f8 100644
--- a/backend/config/settings.py
+++ b/backend/config/settings.py
@@ -119,16 +119,16 @@ if DB_HOST:
     }
 
 
-# DB_HOST = os.environ.get('DB_HOST', '121.43.104.161')
-# if DB_HOST:
-#     DATABASES['default'] = {
-#         'ENGINE': 'django.db.backends.postgresql',
-#         'NAME': os.environ.get('DB_NAME', 'market'),
-#         'USER': os.environ.get('DB_USER', 'market'),
-#         'PASSWORD': os.environ.get('DB_PASSWORD', '123market'),
-#         'HOST': DB_HOST,
-#         'PORT': os.environ.get('DB_PORT', '6433'),
-#     }
+DB_HOST = os.environ.get('DB_HOST', '121.43.104.161')
+if DB_HOST:
+    DATABASES['default'] = {
+        'ENGINE': 'django.db.backends.postgresql',
+        'NAME': os.environ.get('DB_NAME', 'market'),
+        'USER': os.environ.get('DB_USER', 'market'),
+        'PASSWORD': os.environ.get('DB_PASSWORD', '123market'),
+        'HOST': DB_HOST,
+        'PORT': os.environ.get('DB_PORT', '6433'),
+    }
 
 
 # Password validation
diff --git a/miniprogram/src/api/index.ts b/miniprogram/src/api/index.ts
index 682015c..7980538 100644
--- a/miniprogram/src/api/index.ts
+++ b/miniprogram/src/api/index.ts
@@ -94,10 +94,14 @@ export const uploadProjectFile = (filePath: string, projectId: number, fileName?
             'Authorization': `Bearer ${Taro.getStorageSync('token')}`
         }
     }).then(res => {
+        console.log('Upload response:', res)
         if (res.statusCode >= 200 && res.statusCode < 300) {
-            return JSON.parse(res.data)
+            const data = JSON.parse(res.data)
+            console.log('Upload success, data:', data)
+            return data
         }
-        throw new Error('Upload failed')
+        console.error('Upload failed:', res)
+        throw new Error(`Upload failed: ${res.statusCode}`)
     })
 }
 
diff --git a/miniprogram/src/pages/competition/project.tsx b/miniprogram/src/pages/competition/project.tsx
index 87a6ec7..80765cf 100644
--- a/miniprogram/src/pages/competition/project.tsx
+++ b/miniprogram/src/pages/competition/project.tsx
@@ -89,12 +89,20 @@ export default function ProjectEdit() {
           
           Taro.showLoading({ title: '上传中...' })
           
+          console.log('Uploading cover image:', tempFilePaths[0])
           const res = await uploadMedia(tempFilePaths[0], 'image')
-          handleInput('cover_image_url', res.file) // 假设返回 { file: 'url...' }
+          console.log('Cover upload result:', res)
+          
+          // res.file is the OSS URL
+          const coverUrl = res.file || res.file_url || res.url
+          console.log('Cover URL:', coverUrl)
+          handleInput('cover_image_url', coverUrl)
           
           Taro.hideLoading()
+          Taro.showToast({ title: '上传成功', icon: 'success' })
       } catch (e) {
           Taro.hideLoading()
+          console.error('Cover upload error:', e)
           Taro.showToast({ title: '上传失败', icon: 'none' })
       }
   }
@@ -112,25 +120,52 @@ export default function ProjectEdit() {
 
           Taro.showLoading({ title: '上传中...' })
           const file = tempFiles[0]
+          console.log('Uploading file:', file.name, 'path:', file.path)
           
           // @ts-ignore
           const result = await uploadProjectFile(file.path, project.id, file.name)
+          console.log('Upload result:', result)
           
-          // Update file list
+          // Update file list - use file_url_display or file_url
+          const fileUrl = result.file_url_display || result.file_url || ''
           setProject(prev => ({
               ...prev,
-              files: [...(prev.files || []), result]
+              files: [...(prev.files || []), {
+                  ...result,
+                  url: fileUrl
+              }]
           }))
           
           Taro.hideLoading()
           Taro.showToast({ title: '上传成功', icon: 'success' })
       } catch (e) {
           Taro.hideLoading()
-          console.error(e)
+          console.error('Upload error:', e)
           Taro.showToast({ title: '上传失败', icon: 'none' })
       }
   }
 
+  const handlePreviewFile = (file: any) => {
+      const url = file.url || file.file_url_display || file.file_url
+      if (!url) {
+          Taro.showToast({ title: '文件链接无效', icon: 'none' })
+          return
+      }
+      Taro.downloadFile({
+          url: url,
+          success: (res: any) => {
+              if (res.statusCode === 200) {
+                  Taro.openDocument({ filePath: res.tempFilePath }).catch(() => {
+                      Taro.showToast({ title: '无法打开文件', icon: 'none' })
+                  })
+              }
+          },
+          fail: () => {
+              Taro.showToast({ title: '无法打开文件', icon: 'none' })
+          }
+      })
+  }
+
   const handleDeleteFile = (fileId) => {
       // API call to delete file not implemented yet? Or just remove from list?
       // Usually we should call delete API. For now just remove from UI.
@@ -260,10 +295,10 @@ export default function ProjectEdit() {
                 <Button size='mini' style={{ margin: 0, fontSize: '12px' }} onClick={handleUploadFile}>上传附件</Button>
             </View>
             <View className='file-list'>
-                {project.files && project.files.map((file, index) => (
-                    <View key={index} className='file-item' style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', padding: '10px', background: '#f8f8f8', marginBottom: '8px', borderRadius: '4px' }}>
+                {project.files && project.files.map((file: any, index: number) => (
+                    <View key={index} className='file-item' style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', padding: '10px', background: '#f8f8f8', marginBottom: '8px', borderRadius: '4px' }} onClick={() => handlePreviewFile(file)}>
                         <Text className='file-name' style={{ flex: 1, fontSize: '14px', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{file.name || '未知文件'}</Text>
-                        {/* <Text className='delete' style={{ color: 'red', marginLeft: '10px' }} onClick={() => handleDeleteFile(file.id)}>删除</Text> */}
+                        <Text style={{ color: '#1890ff', fontSize: '12px', marginLeft: '10px' }}>点击查看</Text>
                     </View>
                 ))}
                 {(!project.files || project.files.length === 0) && <Text style={{ color: '#999', fontSize: '12px' }}>暂无附件 (PDF/PPT/视频)</Text>}