diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs
index 6af592405..3e4759cfb 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs
@@ -950,7 +950,7 @@ namespace IRaCIS.Core.Application.Contracts
         /// <summary>
         /// 默认SegmentName
         /// </summary>
-        public DefaultSegmentNameDto DefaultSegmentName { get; set; }
+        public DefaultSegmentNameDto DefaultSegmentName { get; set; } = new DefaultSegmentNameDto() { };
 
         public List<string> ReadingToolList { get; set; } = new List<string>() { };