diff --git a/Api/Ewide.Core/Entity/DEntityBase.cs b/Api/Ewide.Core/Entity/DEntityBase.cs
index 5198f2d..3dbabbc 100644
--- a/Api/Ewide.Core/Entity/DEntityBase.cs
+++ b/Api/Ewide.Core/Entity/DEntityBase.cs
@@ -19,7 +19,7 @@ namespace Ewide.Core
         [DatabaseGenerated(DatabaseGeneratedOption.None)]
         [Comment("Id主键")]
         [Column("Id", TypeName = "varchar(36)")]
-        public virtual string Id { get; set; }
+        public virtual string Id { get; set; } = String.Empty;
 
         /// <summary>
         /// 创建时间