diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
index 065e67227..49d73d7a4 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
@@ -422,8 +422,9 @@ namespace SqlSugar
             _WhereClassByPrimaryKey(new List<T>() { data });
             return this;
         }
-        public ISugarQueryable<T> TranLock(DbLockType LockType = DbLockType.Wait) 
+        public ISugarQueryable<T> TranLock(DbLockType? LockType = DbLockType.Wait) 
         {
+            if (LockType == null) return this;
             Check.ExceptionEasy(this.Context.Ado.Transaction == null, "need BeginTran", "需要事务才能使用TranLock");
             Check.ExceptionEasy(this.QueryBuilder.IsSingle()==false, "TranLock, can only be used for single table query", "TranLock只能用在单表查询");
             if (this.Context.CurrentConnectionConfig.DbType == DbType.SqlServer)
diff --git a/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs b/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
index 55548382c..bf9ae51d9 100644
--- a/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
+++ b/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
@@ -58,7 +58,7 @@ namespace SqlSugar
         ISugarQueryable<T> WhereColumns(List<Dictionary<string, object>> columns);
         ISugarQueryable<T> WhereColumns(Dictionary<string, object> columns, bool ignoreDefaultValue);
         ISugarQueryable<T> WhereColumns(Dictionary<string, object> columns);
-        ISugarQueryable<T> TranLock(DbLockType LockType = DbLockType.Wait);
+        ISugarQueryable<T> TranLock(DbLockType? LockType = DbLockType.Wait);
         ISugarQueryable<T> Where(Expression<Func<T, bool>> expression);
         ISugarQueryable<T> Where(string whereString, object parameters = null);
         ISugarQueryable<T> Where(List<IConditionalModel> conditionalModels);