diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
index 2a3669f..2a69aa1 100644
--- a/MainWindow.xaml.cs
+++ b/MainWindow.xaml.cs
@@ -520,7 +520,7 @@ namespace PLCDataMonitor
                                 {
                                     // 创建数据点
                                     var dataPoint = new Tuple<DateTime, double, double>(
-                                        DateTime.Now,
+                                        effectiveTime,
                                         friction1,
                                         friction2
                                     );