diff --git a/tests/unit/test_smart_match_fallback.py b/tests/unit/test_smart_match_fallback.py
index d31fbb88b..1b44e6f19 100644
--- a/tests/unit/test_smart_match_fallback.py
+++ b/tests/unit/test_smart_match_fallback.py
@@ -155,10 +155,10 @@ class TestSmartMatchAvailabilityFallback:
         project = Project(id="proj-1", name="Test", owner_user_id="user-1")
         assets = [
             _video_asset("top-exhausted.mp4", quality=100, used_ranges=_exhausted_ranges(15)),
-            # second 质量分显著高于 third（质量项差 (90-30)*0.4=24 > 噪声上限 20），
+            # second 质量分显著高于 third（质量项差 (95-20)*0.28=21 > 噪声上限 20），
             # 排除耗尽素材后 second 稳定排首位回补（噪声不影响大分差排名）
-            _video_asset("second-fresh.mp4", quality=90, used_ranges=None),
-            _video_asset("third-fresh.mp4", quality=30, used_ranges=None),
+            _video_asset("second-fresh.mp4", quality=95, used_ranges=None),
+            _video_asset("third-fresh.mp4", quality=20, used_ranges=None),
         ]
         repo = _StubAssetRepo(assets)
         app = _make_app(repo, _StubAssetLibraryRepo({"lib-1": _library()}), _StubProjectRepo({"proj-1": project}))