diff --git a/Src/Asp.Net/OracleTest/UnitTest/UCodeFirst.cs b/Src/Asp.Net/OracleTest/UnitTest/UCodeFirst.cs
index e11619c3c..79f02c374 100644
--- a/Src/Asp.Net/OracleTest/UnitTest/UCodeFirst.cs
+++ b/Src/Asp.Net/OracleTest/UnitTest/UCodeFirst.cs
@@ -1,4 +1,5 @@
-using System;
+using SqlSugar;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -14,6 +15,22 @@ namespace OrmTest
                 Db.DbMaintenance.DropTable("UnitCodeTest1");
             Demo2();
             Demo3();
+            Db.CodeFirst.InitTables<TESTA1>();
+            var xx = Db.DbMaintenance.GetColumnInfosByTableName("TESTA1", false);
+            Db.DbMaintenance.AddColumn("TESTA1", new DbColumnInfo()
+            {
+                DbColumnName = "aaa" + new Random().Next(2, 99999),
+                PropertyName = "aaa" + new Random().Next(2, 99999),
+                TableName = "TESTA1",
+                IsNullable = true,
+                DataType = "varchar",
+                Length = 11
+            });
+            // db.Utilities.RemoveCacheAll();
+            var xxxxx = Db.DbMaintenance.GetColumnInfosByTableName("TESTA1", false);
+        }
+        public class TESTA1 { 
+           public string X { get; set; }
         }
 
         private static void Demo2()
diff --git a/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
index 3696cea80..8cdd64744 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs
@@ -191,7 +191,7 @@ namespace SqlSugar
                                                           dbColumns.Any(dc => dc.DbColumnName.Equals(ec.DbColumnName)
                                                                && ((ec.Length != dc.Length && !UtilMethods.GetUnderType(ec.PropertyInfo).IsEnum() && UtilMethods.GetUnderType(ec.PropertyInfo).IsIn(UtilConstants.StringType)) ||
                                                                     ec.IsNullable != dc.IsNullable ||
-                                                                    IsSamgeType(ec, dc)))).ToList();
+                                                                    IsNoSamgeType(ec, dc)))).ToList();
                 var renameColumns = entityColumns
                     .Where(it => !string.IsNullOrEmpty(it.OldDbColumnName))
                     .Where(entityColumn => dbColumns.Any(dbColumn => entityColumn.OldDbColumnName.Equals(dbColumn.DbColumnName, StringComparison.CurrentCultureIgnoreCase)))
@@ -343,7 +343,7 @@ namespace SqlSugar
             }
         }
 
-        protected virtual bool IsSamgeType(EntityColumnInfo ec, DbColumnInfo dc)
+        protected virtual bool IsNoSamgeType(EntityColumnInfo ec, DbColumnInfo dc)
         {
             if (!string.IsNullOrEmpty(ec.DataType))
             {
@@ -365,6 +365,22 @@ namespace SqlSugar
             {
                 return false;
             }
+            if (properyTypeName?.ToLower() == "varchar" && dataType?.ToLower() == "string") 
+            {
+                return false;
+            }
+            if (properyTypeName?.ToLower() == "number" && dataType?.ToLower() == "decimal")
+            {
+                return false;
+            }
+            if (properyTypeName?.ToLower() == "int" && dataType?.ToLower() == "decimal"&&dc.Length==22&&dc.Scale==0&&this.Context.CurrentConnectionConfig.DbType==DbType.Oracle)
+            {
+                return false;
+            }
+            if (properyTypeName?.ToLower() == "date" && dataType?.ToLower() == "datetime")
+            {
+                return false;
+            }
             return properyTypeName != dataType;
         }
         private static string GetType(string name)