diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
index 3e496c83e..d0dff3dfb 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
@@ -1748,7 +1748,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             decimal percentage = 0;
             if (baseLineSpleenLength != 0)
             {
-                percentage = differenceValue * 100 / baseLineSpleenLength;
+                percentage = differenceValue * 100 / (baseLineSpleenLength-130);
             }
 
             //  1、基线 垂直径> 130 mm