diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/Dm/SqlBuilder/DmExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/Dm/SqlBuilder/DmExpressionContext.cs
index 8e82144fb..95994b886 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/Dm/SqlBuilder/DmExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/Dm/SqlBuilder/DmExpressionContext.cs
@@ -310,11 +310,12 @@ namespace SqlSugar
             var parameterNameB = mode.Args[1].MemberName;
             return $" SUBSTR({parameterNameA}, 1, {parameterNameB})  ";
         }
+         
         public override string Right(MethodCallExpressionModel mode)
         {
             var parameterNameA = mode.Args[0].MemberName;
             var parameterNameB = mode.Args[1].MemberName;
-            return $" SUBSTR({parameterNameA}, -2, {parameterNameB})  ";
+            return $" SUBSTR({parameterNameA}, -{parameterNameB}, {parameterNameB})  ";  //hdl 20260121
         }
 
         public override string Ceil(MethodCallExpressionModel mode)
diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
index e4d1d3390..af87f010c 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
@@ -435,7 +435,7 @@ namespace SqlSugar
         {
             var parameterNameA = mode.Args[0].MemberName;
             var parameterNameB = mode.Args[1].MemberName;
-            return $" SUBSTR({parameterNameA}, (LENGTH({parameterNameA})-2), {parameterNameB})  ";
+            return $" SUBSTR({parameterNameA}, -{parameterNameB}, {parameterNameB})  ";  //hdl 20260121
         }
 
         public override string Ceil(MethodCallExpressionModel mode)
diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs
index f6c6c5e7d..b0f0ea856 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs
@@ -362,7 +362,7 @@ namespace SqlSugar
         {
             var parameterNameA = mode.Args[0].MemberName;
             var parameterNameB = mode.Args[1].MemberName;
-            return $" SUBSTR({parameterNameA}, -2, {parameterNameB})  ";
+            return $" SUBSTR({parameterNameA}, -{parameterNameB}, {parameterNameB})  ";  //修改 20260121
         }
 
         public override string NewUid(MethodCallExpressionModel mode)