diff --git a/backend/app/routers/ocr.py b/backend/app/routers/ocr.py
index 961914e..c49155d 100644
--- a/backend/app/routers/ocr.py
+++ b/backend/app/routers/ocr.py
@@ -296,7 +296,7 @@ async def claim_temp_image(
     oss_key = get_oss_path("collection", user_id=current_user.f99_90_id, collection_id=collection_id, filename=final_filename)
     
     # 尝试从OSS获取临时图片 - 尝试多种扩展名和日期路径
-    temp_extensions = ['jpg', 'jpeg', 'png', 'gif']
+    temp_extensions = ['jpg', 'jpeg', 'png', 'gif', 'JPG', 'JPEG', 'PNG', 'GIF']
     temp_content = None
     found_key = None