diff --git a/IRaCIS.Core.Application/Service/Management/DTO/UserModel.cs b/IRaCIS.Core.Application/Service/Management/DTO/UserModel.cs
index a54ec9ad4..3f22371f2 100644
--- a/IRaCIS.Core.Application/Service/Management/DTO/UserModel.cs
+++ b/IRaCIS.Core.Application/Service/Management/DTO/UserModel.cs
@@ -39,7 +39,7 @@ namespace IRaCIS.Application.Contracts
         public Guid Id { get; set; }
         public string UserName { get; set; } = string.Empty;
         public string RealName { get; set; } = string.Empty;
-        public int Sex { get; set; } // 1-男  2-女
+        public int? Sex { get; set; } // 1-男  2-女
 
 		/// <summary>
 		/// LastLoginIP
@@ -131,7 +131,7 @@ namespace IRaCIS.Application.Contracts
         public string FirstName { get; set; } = string.Empty;
 
         public string LastName { get; set; } = string.Empty;
-        public int Sex { get; set; } // 1-男  2-女
+        public int? Sex { get; set; } // 1-男  2-女
 
         public int Status { get; set; } = 1; // 0-已删除 1-正常
 
diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/UserTrialViewModel.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/UserTrialViewModel.cs
index a2fdd4c03..a6d85a694 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/UserTrialViewModel.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/UserTrialViewModel.cs
@@ -321,7 +321,7 @@ namespace IRaCIS.Application.Contracts
     public class TrialUserScreeningDTO : TrialUserAddCommand
     {
 
-        public int Sex { get; set; } // 1-男  2-女
+        public int? Sex { get; set; } // 1-男  2-女
 
         public string Phone { get; set; } = string.Empty;
         public string EMail { get; set; } = string.Empty;
diff --git a/IRaCIS.Core.Domain/Management/User.cs b/IRaCIS.Core.Domain/Management/User.cs
index 775c56fd5..099b0a9f9 100644
--- a/IRaCIS.Core.Domain/Management/User.cs
+++ b/IRaCIS.Core.Domain/Management/User.cs
@@ -36,7 +36,7 @@ namespace IRaCIS.Core.Domain.Models
 
         public string Phone { get; set; } = string.Empty;
         public string EMail { get; set; } = string.Empty;
-        public int Sex { get; set; }
+        public int? Sex { get; set; }
         public UserStateEnum Status { get; set; } = UserStateEnum.Enable;
 
         public DateTime? LastLoginTime { get; set; }