diff --git a/DentistryHandpieces/MainWindowViewModel.cs b/DentistryHandpieces/MainWindowViewModel.cs
index debd641..e4d9410 100644
--- a/DentistryHandpieces/MainWindowViewModel.cs
+++ b/DentistryHandpieces/MainWindowViewModel.cs
@@ -3348,8 +3348,11 @@ public sealed class MainWindowViewModel : ObservableObject
 
     private void UpdateNoLoadSpeedDisplay()
     {
-        NoLoadSpeedRecordText = $"{FormatSpeed(_noLoadSpeedRecord)} r/min";
-        NoLoadSpeedErrorRateText = $"{FormatErrorRate(_noLoadSpeedErrorRate)} %";
+        // 空载转速实时显示当前转速
+        NoLoadSpeedRecordText = $"{FormatSpeed(_realtimeSpeed)} r/min";
+
+        // 转速误差率直接读取 PLC D102 寄存器值，不显示负值
+        NoLoadSpeedErrorRateText = $"{FormatErrorRate(Math.Abs(_noLoadSpeedErrorRate))} %";
     }
 
     private void AppendTorqueSample(double value, DateTime sampledAt)