diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
index 400986988..ca81c1707 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
@@ -1296,7 +1296,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
         public async Task<decimal?> GetAvgFCT(ReadingCalculateDto inDto)
         {
             return inDto.QuestionInfo.Where(x => x.LesionType == LesionType.ROI).SelectMany(x => x.TableRowInfoList).SelectMany(x => x.TableQuestionList)
-             .Where(x => x.QuestionMark == QuestionMark.AvgFCT).Select(x => x.Answer.IsNullOrEmptyReturn0()).DefaultIfEmpty(0).Average();
+             .Where(x => x.QuestionMark == QuestionMark.AvgFCT).Select(x => x.Answer.IsNullOrEmptyReturn0()).Where(x=>x!=0).DefaultIfEmpty(0).Average();
         }
 
         /// <summary>