diff --git a/Wpf_AiSportsMicrospace/Common/SportOperate.cs b/Wpf_AiSportsMicrospace/Common/SportOperate.cs
index ac85c7c..e7cd12a 100644
--- a/Wpf_AiSportsMicrospace/Common/SportOperate.cs
+++ b/Wpf_AiSportsMicrospace/Common/SportOperate.cs
@@ -30,8 +30,6 @@ namespace Wpf_AiSportsMicrospace.Common
         private const int WaveThreshold = 4;
         WebcamClient _webcamClient;
 
-        private DateTime _lastActionTime = DateTime.MinValue;
-
         private DateTime? _raiseStartTime = null;
         private DateTime? _wristStartTime = null;
         private bool _firstHandTriggered = false;