diff --git a/ChanPivotMonitor.py b/ChanPivotMonitor.py
index d6e29f7..296704d 100644
--- a/ChanPivotMonitor.py
+++ b/ChanPivotMonitor.py
@@ -111,9 +111,9 @@ class ChanPivotMonitor:
 
     @staticmethod
     def _make_zs_id(zs) -> tuple:
-        """生成中枢的稳定标识（基于首笔首K线索引，不依赖 zs.index）"""
+        """生成中枢的稳定标识（基于首笔首K线时间戳，不随 DataFrame 窗口偏移而变化）"""
         bi0 = zs.bi_list[0]
-        return (bi0.start_klc.index,)
+        return (bi0.start_klc.start_time,)
 
     @staticmethod
     def _find_current_zs(bi_zs_list: list):