diff --git a/app/api/endpoints/system.py b/app/api/endpoints/system.py
index 3251b2f5..74e9c25d 100644
--- a/app/api/endpoints/system.py
+++ b/app/api/endpoints/system.py
@@ -76,7 +76,7 @@ def fetch_image(
             try:
                 content = cache_path.read_bytes()
                 etag = HashUtils.md5(content)
-                headers = RequestUtils.generate_cache_headers(etag)
+                headers = RequestUtils.generate_cache_headers(etag, max_age=86400 * 7)
                 if if_none_match == etag:
                     return Response(status_code=304, headers=headers)
                 return Response(content=content, media_type="image/jpeg", headers=headers)
diff --git a/app/startup/modules_initializer.py b/app/startup/modules_initializer.py
index d7dc0d3f..f5701b06 100644
--- a/app/startup/modules_initializer.py
+++ b/app/startup/modules_initializer.py
@@ -64,10 +64,12 @@ def stop_frontend():
 
 def clear_temp():
     """
-    清理临时目录中3天前的文件
+    清理临时文件和图片缓存
     """
-    # 清理3天前的文件
+    # 清理临时目录中3天前的文件
     SystemUtils.clear(settings.TEMP_PATH, days=3)
+    # 清理图片缓存目录中7天前的文件
+    SystemUtils.clear(settings.CACHE_PATH / "images", days=7)
 
 
 def check_auth():
diff --git a/app/utils/system.py b/app/utils/system.py
index 19923058..961d71b4 100644
--- a/app/utils/system.py
+++ b/app/utils/system.py
@@ -7,7 +7,7 @@ import subprocess
 import sys
 from glob import glob
 from pathlib import Path
-from typing import List, Union, Tuple, Optional
+from typing import List, Optional, Tuple, Union
 
 import docker
 import psutil
@@ -537,11 +537,18 @@ class SystemUtils:
     @staticmethod
     def clear(temp_path: Path, days: int):
         """
-        清理临时目录中指定天数前的文件
+        清理指定目录中指定天数前的文件，递归删除子文件及空文件夹
         """
         if not temp_path.exists():
             return
-        for file in temp_path.glob('*'):
-            if file.is_file() \
-                    and (datetime.datetime.now() - datetime.datetime.fromtimestamp(file.stat().st_mtime)).days > days:
+        # 遍历目录及子目录中的所有文件和文件夹
+        for file in temp_path.rglob('*'):
+            # 如果是文件并且符合时间条件，则删除
+            if file.is_file() and (
+                    datetime.datetime.now() - datetime.datetime.fromtimestamp(file.stat().st_mtime)).days > days:
                 file.unlink()
+        # 删除空的文件夹
+        for folder in sorted(temp_path.rglob('*'), reverse=True):
+            # 确保是空文件夹
+            if folder.is_dir() and not any(folder.iterdir()):
+                folder.rmdir()