diff --git a/Falcon.SugarApi/DatabaseDefinitions/EntityGuidId.cs b/Falcon.SugarApi/DatabaseDefinitions/EntityGuidId.cs
index a877e1f..798e075 100644
--- a/Falcon.SugarApi/DatabaseDefinitions/EntityGuidId.cs
+++ b/Falcon.SugarApi/DatabaseDefinitions/EntityGuidId.cs
@@ -11,6 +11,6 @@ namespace Falcon.SugarApi.DatabaseDefinitions
         /// 主键
         /// </summary>
         [SugarColumn(IsPrimaryKey = true,ColumnDescription = "主键")]
-        public Guid Id { get; set; } = Guid.NewGuid();
+        public Guid? Id { get; set; } = Guid.NewGuid();
     }
 }
diff --git a/Falcon.SugarApi/DatabaseDefinitions/EntityIntId.cs b/Falcon.SugarApi/DatabaseDefinitions/EntityIntId.cs
index 5b4c12a..903ae4d 100644
--- a/Falcon.SugarApi/DatabaseDefinitions/EntityIntId.cs
+++ b/Falcon.SugarApi/DatabaseDefinitions/EntityIntId.cs
@@ -11,6 +11,6 @@ namespace Falcon.SugarApi.DatabaseDefinitions
         /// 主键 默认GUID 382c74c3-721d-4f34-80e5-57657b6cbc27
         /// </summary>
         [SugarColumn(IsPrimaryKey = true,ColumnDescription = "主键")]
-        public int Id { get; set; }
+        public int? Id { get; set; }
     }
 }
diff --git a/Falcon.SugarApi/DatabaseDefinitions/EntityStringId.cs b/Falcon.SugarApi/DatabaseDefinitions/EntityStringId.cs
index 2ec6ad3..85f650f 100644
--- a/Falcon.SugarApi/DatabaseDefinitions/EntityStringId.cs
+++ b/Falcon.SugarApi/DatabaseDefinitions/EntityStringId.cs
@@ -13,6 +13,6 @@ namespace Falcon.SugarApi.DatabaseDefinitions
         /// </summary>
         [SugarColumn(IsPrimaryKey = true,ColumnDescription = "主键")]
         [MaxLength(36)] 
-        public string Id { get; set; }
+        public string? Id { get; set; }
     }
 }