diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs
index 825861e56..13aaf92d1 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs
@@ -933,6 +933,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
                         needAddList.Add(new ReadingTaskQuestionAnswer()
                         {
                             Answer = item.Answer,
+                            PCWGInterimAnswer=null,
                             ReadingQuestionTrialId = item.QuestionId,
                         });
                     }