diff --git a/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs b/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs
index 159d74d97..28899232a 100644
--- a/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs
+++ b/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs
@@ -16,6 +16,17 @@ namespace OrmTest
             Async();
             NoEntity();
             Mapper();
+            SqlFuncTest();
+        }
+
+        private static void SqlFuncTest()
+        {
+            Console.WriteLine("");
+            Console.WriteLine("#### SqlFunc Start ####");
+            var db = GetInstance();
+            var index= db.Queryable<Order>().Select(it => SqlFunc.CharIndex("a", "cccacc")).First();
+
+            Console.WriteLine("#### End Start ####");
         }
 
         private static void Mapper()
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
index b91e925a4..f170c51e1 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs
@@ -353,5 +353,9 @@ namespace SqlSugar
             }
             return reslut.ToString();
         }
+        public virtual string CharIndex(MethodCallExpressionModel model)
+        {
+            return string.Format("CHARINDEX ({0},{1})", model.Args[0].MemberName, model.Args[1].MemberName);
+        }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
index 5e6c1b752..8ede5cbab 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs
@@ -60,5 +60,6 @@ namespace SqlSugar
         string Null();
         string GetDate();
         string GetRandom();
+        string CharIndex(MethodCallExpressionModel model);
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
index 4ea9dc4dc..74a199270 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/SqlFunc.cs
@@ -118,5 +118,6 @@ namespace SqlSugar
         /// <returns></returns>
         public static Subqueryable<T> Subqueryable<T>() where T:class,new(){ throw new NotSupportedException("Can only be used in expressions");}
         public static CaseThen  IF(bool condition) { throw new NotSupportedException("Can only be used in expressions"); }
+        public static int CharIndex(string findChar,string searchValue) { throw new NotSupportedException("Can only be used in expressions"); }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
index 725005dae..b6ce8270c 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
@@ -585,6 +585,8 @@ namespace SqlSugar
                         return this.Context.DbMehtods.GetDate();
                     case "GetRandom":
                         return this.Context.DbMehtods.GetRandom();
+                    case "CharIndex":
+                        return this.Context.DbMehtods.CharIndex(model);
                     default:
                         break;
                 }
diff --git a/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs b/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs
index fc428042a..eaa2bf67a 100644
--- a/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/MySql/SqlBuilder/MySqlExpressionContext.cs
@@ -138,5 +138,10 @@ namespace SqlSugar
         {
             return "rand()";
         }
+
+        public override string CharIndex(MethodCallExpressionModel model)
+        {
+            return string.Format("instr ({0},{1})", model.Args[0].MemberName, model.Args[1].MemberName);
+        }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs b/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
index 91ceb6b44..0493018d7 100644
--- a/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs
@@ -185,5 +185,10 @@ namespace SqlSugar
         {
             return "dbms_random.value";
         }
+
+        public override string CharIndex(MethodCallExpressionModel model)
+        {
+            return string.Format("instr ({0},{1},1,1) ", model.Args[0].MemberName, model.Args[1].MemberName);
+        }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs b/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs
index 4303b8815..22494adfd 100644
--- a/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqlBuilder/SqliteExpressionContext.cs
@@ -221,5 +221,10 @@ namespace SqlSugar
         {
             return "RANDOM()";
         }
+
+        public override string CharIndex(MethodCallExpressionModel model)
+        {
+            throw new NotSupportedException("Slqite Not Supported CharIndex");
+        }
     }
 }