diff --git a/dialogue_download_change.py b/dialogue_download_change.py
index 2ac5281..a08f3e6 100644
--- a/dialogue_download_change.py
+++ b/dialogue_download_change.py
@@ -34,12 +34,18 @@ def choose_input_file():
 
 def clean_filename(url):
     try:
-        # 提取fdId参数
+        # 首先检查URL是否有常见的图片扩展名
+        image_extensions = ('.jpg', '.jpeg', '.png', '.gif', '.bmp', '.webp')
+        if url.lower().endswith(image_extensions):
+            # 如果有扩展名，直接使用URL的最后部分作为文件名
+            return os.path.basename(url)
+        
+        # 如果没有常见扩展名，则检查fdId
         fd_id = re.search(r'fdId=([0-9a-f]+)', url)
         if fd_id:
             return f"{fd_id.group(1)}.jpg"
         
-        # 如果没有fdId，使用时间戳
+        # 如果既没有扩展名也没有fdId，使用时间戳
         return f"image_{int(time.time())}.jpg"
     except:
         return f"image_{int(time.time())}.jpg"
@@ -100,9 +106,11 @@ def download_images():
         new_content = markdown_content
         for old_url, new_path in url_mapping.items():
             new_content = new_content.replace(old_url, new_path)
-        
+                # 构造新的文件名
+        file_name, file_ext = os.path.splitext(markdown_file_path)
+        new_file_path = f"{file_name}_local{file_ext}"
         # 保存更新后的Markdown文件
-        with open(markdown_file_path, 'w', encoding='utf-8') as file:
+        with open(new_file_path, 'w', encoding='utf-8') as file:
             file.write(new_content)
         
         messagebox.showinfo("完成", f"成功下载 {success_count} 张图片并更新Markdown文件")