diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs
index 9997ebf6b..660b19400 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/IRECIST1Point1CalculateService.cs
@@ -2090,7 +2090,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
 
             }
 
-            NewTargetLesionAssessment? result = null;
+            NewTargetLesionAssessment? result = NewTargetLesionAssessment.ND;
 
             // if（所有新靶病灶消失或一直不存在任何新靶病灶） 
             if(data.NotExistsNewTargetLesion||data.AllVanish)