diff --git a/ViewModel/Grading/GradingResultVM.cs b/ViewModel/Grading/GradingResultVM.cs
index 55b148b..afac558 100644
--- a/ViewModel/Grading/GradingResultVM.cs
+++ b/ViewModel/Grading/GradingResultVM.cs
@@ -670,12 +670,12 @@ public class GradingResultVM : BaseViewModel
     }
     private double calSymValue(double Min, double Max, double Avg,bool isPercentage = true)
     {
-        int c = 100;
+        int c = 1;
         if (isPercentage)
         {
-            c = 10000;
+            c = 100;
         }
-        return (Max - Min) / Avg * c;
+        return (Max - Min)  * c;
     }
     [Log]
     private DataInfo getDIAMETER(AlgorithmResultEntity result)