diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
index 7fa331125..866294bed 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
@@ -188,6 +188,15 @@ namespace SqlSugar
             result.QueryBuilder.JoinQueryInfos.Last().TableName = tableName;
             return result;
         }
+        public ISugarQueryable<T, T2> LeftJoinIF<T2>(bool isLeftJoin, Expression<Func<T, T2, bool>> joinExpression) 
+        {
+            var result = LeftJoin(joinExpression);
+            if (isLeftJoin == false)
+            {
+                result.QueryBuilder.JoinQueryInfos.Remove(result.QueryBuilder.JoinQueryInfos.Last());
+            }
+            return result;
+        }
         public ISugarQueryable<T, T2> LeftJoin<T2>(Expression<Func<T, T2, bool>> joinExpression)
         {
             if (MasterHasWhereFirstJoin())
diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider02-05.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider02-05.cs
index b79eec668..928566797 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider02-05.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider02-05.cs
@@ -20,6 +20,15 @@ namespace SqlSugar
         {
             return this.Select(expression).MergeTable();
         }
+        public ISugarQueryable<T, T2, T3> LeftJoinIF<T3>(bool isLeftJoin, Expression<Func<T, T2, T3, bool>> joinExpression) 
+        {
+            var result = LeftJoin(joinExpression);
+            if (isLeftJoin==false)
+            {
+                result.QueryBuilder.JoinQueryInfos.Remove(result.QueryBuilder.JoinQueryInfos.Last());
+            }
+            return result;
+        }
         public ISugarQueryable<T, T2, T3> LeftJoin<T3>(ISugarQueryable<T3> joinQueryable, Expression<Func<T, T2, T3, bool>> joinExpression)
         {
             this.Context.InitMappingInfo<T3>();
@@ -595,6 +604,15 @@ namespace SqlSugar
         {
             return this.Select(expression).MergeTable();
         }
+        public ISugarQueryable<T, T2, T3, T4> LeftJoinIF<T4>(bool isLeftJoin, Expression<Func<T, T2, T3, T4, bool>> joinExpression) 
+        {
+            var result = LeftJoin(joinExpression);
+            if (isLeftJoin == false)
+            {
+                result.QueryBuilder.JoinQueryInfos.Remove(result.QueryBuilder.JoinQueryInfos.Last());
+            }
+            return result;
+        }
         public ISugarQueryable<T, T2, T3, T4> LeftJoin<T4>(ISugarQueryable<T4> joinQueryable, Expression<Func<T, T2, T3, T4, bool>> joinExpression)
         {
             this.Context.InitMappingInfo<T4>();
diff --git a/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs b/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
index cac7e11cd..67f4a7c96 100644
--- a/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
+++ b/Src/Asp.Net/SqlSugar/Interface/IQueryable.cs
@@ -33,6 +33,7 @@ namespace SqlSugar
         ISugarQueryable<T, T2> RightJoin<T2>(ISugarQueryable<T2> joinQueryable, Expression<Func<T, T2, bool>> joinExpression);
         ISugarQueryable<T, T2> FullJoin<T2>(ISugarQueryable<T2> joinQueryable, Expression<Func<T, T2, bool>> joinExpression);
         ISugarQueryable<T,T2> LeftJoin<T2>(Expression<Func<T,T2,bool>> joinExpression);
+        ISugarQueryable<T, T2> LeftJoinIF<T2>(bool isLeftJoin,Expression<Func<T, T2, bool>> joinExpression);
         ISugarQueryable<T, T2> LeftJoin<T2>(Expression<Func<T, T2, bool>> joinExpression,string tableName);
         ISugarQueryable<T, T2> FullJoin<T2>(Expression<Func<T, T2, bool>> joinExpression);
         ISugarQueryable<T, T2> FullJoin<T2>(Expression<Func<T, T2, bool>> joinExpression,string tableName);
@@ -257,6 +258,7 @@ namespace SqlSugar
     public partial interface ISugarQueryable<T, T2> : ISugarQueryable<T>
     {
         ISugarQueryable<TResult> SelectMergeTable<TResult>(Expression<Func<T,T2, TResult>> expression);
+        ISugarQueryable<T, T2,T3> LeftJoinIF<T3>(bool isLeftJoin, Expression<Func<T, T2,T3, bool>> joinExpression);
         ISugarQueryable<T, T2,T3> LeftJoin<T3>(ISugarQueryable<T3> joinQueryable, Expression<Func<T, T2,T3, bool>> joinExpression);
         ISugarQueryable<T, T2,T3> InnerJoin<T3>(ISugarQueryable<T3> joinQueryable, Expression<Func<T, T2,T3, bool>> joinExpression);
         ISugarQueryable<T, T2,T3> RightJoin<T3>(ISugarQueryable<T3> joinQueryable, Expression<Func<T, T2,T3, bool>> joinExpression);
@@ -373,6 +375,7 @@ namespace SqlSugar
     public partial interface ISugarQueryable<T, T2, T3> : ISugarQueryable<T>
     {
         ISugarQueryable<TResult> SelectMergeTable<TResult>(Expression<Func<T, T2,T3, TResult>> expression);
+        ISugarQueryable<T, T2, T3,T4> LeftJoinIF<T4>(bool isLeftJoin, Expression<Func<T, T2, T3,T4, bool>> joinExpression);
         ISugarQueryable<T, T2, T3,T4> LeftJoin<T4>(ISugarQueryable<T4> joinQueryable, Expression<Func<T, T2, T3,T4, bool>> joinExpression);
         ISugarQueryable<T, T2, T3,T4> InnerJoin<T4>(ISugarQueryable<T4> joinQueryable, Expression<Func<T, T2, T3,T4, bool>> joinExpression);
         ISugarQueryable<T, T2, T3,T4> RightJoin<T4>(ISugarQueryable<T4> joinQueryable, Expression<Func<T, T2, T3,T4, bool>> joinExpression);