diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs
index 077e5c47a..543d30833 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/PCWG3CalculateService.cs
@@ -61,7 +61,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             this._readingTaskQuestionAnswerRepository = readingTaskQuestionAnswerRepository;
         }
 
-        private List<SiteVisitForTumor> siteVisitForTumorList = new List<SiteVisitForTumor>();
+        private List<SiteVisitForTumor> siteVisitForTumorList;
 
 		/// <summary>
 		/// 获取阅片的计算数据