diff --git a/ViewModel/Grading/GradingResultVM.cs b/ViewModel/Grading/GradingResultVM.cs
index b90f65b..537ca20 100644
--- a/ViewModel/Grading/GradingResultVM.cs
+++ b/ViewModel/Grading/GradingResultVM.cs
@@ -1621,7 +1621,9 @@ public class GradingResultVM : BaseViewModel
     [Log]
     private string FormatDouble_D(double value)
     {
-        return value.ToString("f2");
+        // 2025/03/28 维护阶段发现直径切舍为四舍五入,现在改成直接切割
+        //return value.ToString("f2");
+        return (Math.Floor(value*100)/100).ToString("f2");
     }
     /// <summary>
     /// 百分比用的小数格式化