diff --git a/packages/shared/ai_service.py b/packages/shared/ai_service.py
index c8a066b1d..32014d23d 100755
--- a/packages/shared/ai_service.py
+++ b/packages/shared/ai_service.py
@@ -339,7 +339,7 @@ def _call_ai_cover_service(
                 logger.info("调用 MediaKit 抽帧: plan_id=%s video=%s", plan_id, primary_video_url[:80])
                 frames = client.extract_frames(
                     video_url=primary_video_url,
-                    strategy="SceneChange",
+                    strategy="TimeInterval",
                     max_frames=5,
                 )