diff --git a/tests/unit/test_video_processor_pure.py b/tests/unit/test_video_processor_pure.py
index 6819e465b..9a62f29f5 100755
--- a/tests/unit/test_video_processor_pure.py
+++ b/tests/unit/test_video_processor_pure.py
@@ -283,7 +283,6 @@ class TestVideoProcessorConcatFileFormat:
 
     def test_concat_file_format(self, tmp_path):
         """concat 临时文件格式符合 FFmpeg concat demuxer 规范."""
-        import os
 
         vp = VideoProcessor(temp_dir=str(tmp_path))