diff --git a/packages/domain/plan_generator_utils.py b/packages/domain/plan_generator_utils.py
index e19a1fd35..d87ebf2af 100755
--- a/packages/domain/plan_generator_utils.py
+++ b/packages/domain/plan_generator_utils.py
@@ -258,7 +258,7 @@ def _calc_random_start_time(
     # 如果尝试多次仍找不到，缩短时长使用素材末尾
     # 找到最后一个已使用段之后的可用空间
     last_used_end = 0.0
-    for seg_start, seg_end in used:
+    for _seg_start, seg_end in used:
         last_used_end = max(last_used_end, seg_end)
 
     if last_used_end < total_duration: