diff --git a/video-gen-api/app/services/resource_signed_url_service.py b/video-gen-api/app/services/resource_signed_url_service.py
index d14d7fdb..96b99d52 100644
--- a/video-gen-api/app/services/resource_signed_url_service.py
+++ b/video-gen-api/app/services/resource_signed_url_service.py
@@ -212,9 +212,9 @@ def build_resource_signed_url(
 
         http://www.test6.com/generation/video/a.mp4?from=history&exp=1780000000&sign=xxxx
     """
-    if not resource_url:
+    if not resource_url or not resource_url.startswith("/generate/"):
         return resource_url
-
+    
     seconds = _get_sign_expire_seconds(expire_seconds)
     current_ts = _to_int(now_ts, int(time.time())) if now_ts is not None else int(time.time())