diff --git a/IRaCIS.Core.Application/Service/Reading/Dto/ReadingMedicineQuestionViewModel.cs b/IRaCIS.Core.Application/Service/Reading/Dto/ReadingMedicineQuestionViewModel.cs
index a43a0dd73..75bba26e6 100644
--- a/IRaCIS.Core.Application/Service/Reading/Dto/ReadingMedicineQuestionViewModel.cs
+++ b/IRaCIS.Core.Application/Service/Reading/Dto/ReadingMedicineQuestionViewModel.cs
@@ -16,7 +16,7 @@ namespace IRaCIS.Core.Application.ViewModel
 		/// <summary>
 		/// 父问题触发
 		/// </summary>
-		public string ParentTriggerValue { get; set; }
+		public string ParentTriggerValue { get; set; } = string.Empty;
 
 		/// <summary>
 		/// 问题名称
@@ -174,7 +174,7 @@ namespace IRaCIS.Core.Application.ViewModel
 	 		public Guid Id { get; set; }
 	 	
 	 		public string Type { get; set; }
-	 		public string ParentTriggerValue { get; set; }
+	 		public string ParentTriggerValue { get; set; }=string.Empty;
 	 		public string QuestionName { get; set; }
 	 		public string TypeValue { get; set; }
 	 		public Guid TrialId { get; set; }
diff --git a/IRaCIS.Core.Domain/Reading/ReadingMedicineSystemQuestion.cs b/IRaCIS.Core.Domain/Reading/ReadingMedicineSystemQuestion.cs
index a96bbf35e..e749c7a9d 100644
--- a/IRaCIS.Core.Domain/Reading/ReadingMedicineSystemQuestion.cs
+++ b/IRaCIS.Core.Domain/Reading/ReadingMedicineSystemQuestion.cs
@@ -24,7 +24,7 @@ namespace IRaCIS.Core.Domain.Models
 		/// <summary>
 		/// 父问题触发
 		/// </summary>
-		public string ParentTriggerValue { get; set; }
+		public string ParentTriggerValue { get; set; } = string.Empty;
 
 		/// <summary>
 		/// 问题名称
diff --git a/IRaCIS.Core.Domain/Reading/ReadingMedicineTrialQuestion.cs b/IRaCIS.Core.Domain/Reading/ReadingMedicineTrialQuestion.cs
index 01a722583..dfc4ec374 100644
--- a/IRaCIS.Core.Domain/Reading/ReadingMedicineTrialQuestion.cs
+++ b/IRaCIS.Core.Domain/Reading/ReadingMedicineTrialQuestion.cs
@@ -29,11 +29,11 @@ namespace IRaCIS.Core.Domain.Models
 		/// <summary>
         /// 父问题触发值
         /// </summary>
-		public string ParentTriggerValue { get; set; }
-	
+		public string ParentTriggerValue { get; set; } = string.Empty;
+
 		/// <summary>
-        /// 问题名称
-        /// </summary>
+		/// 问题名称
+		/// </summary>
 		public string QuestionName { get; set; }
 	
 		/// <summary>