diff --git a/FreeSql.Tests/FreeSql.Tests/Issues/1270.cs b/FreeSql.Tests/FreeSql.Tests/Issues/1270.cs
new file mode 100644
index 00000000..fb7a8088
--- /dev/null
+++ b/FreeSql.Tests/FreeSql.Tests/Issues/1270.cs
@@ -0,0 +1,119 @@
+using FreeSql.DataAnnotations;
+using FreeSql.Internal;
+using System.Diagnostics;
+using Xunit;
+
+namespace FreeSql.Tests.Issues
+{
+    public class _1270
+    {
+        [Fact]
+        public void UseNameConvert()
+        {
+            using (var fsql = new FreeSqlBuilder()
+                .UseConnectionString(DataType.Sqlite, "Data Source=:memory:")
+                .UseNameConvert(NameConvertType.None)
+                .UseAutoSyncStructure(true)
+                .Build())
+            {
+                var ddl = fsql.CodeFirst.GetComparisonDDLStatements<SysUser>();
+                Assert.Equal(@"CREATE TABLE IF NOT EXISTS ""main"".""SysUser"" (  
+  ""Id"" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
+  ""UserName"" NVARCHAR(255)
+) 
+;
+", ddl);
+            }
+
+            using (var fsql = new FreeSqlBuilder()
+                .UseConnectionString(DataType.Sqlite, "Data Source=:memory:")
+                .UseNameConvert(NameConvertType.PascalCaseToUnderscore)
+                .UseAutoSyncStructure(true)
+                .Build())
+            {
+                fsql.CodeFirst.ConfigEntity<SysUser>(a => { });
+                var ddl = fsql.CodeFirst.GetComparisonDDLStatements<SysUser>();
+                Assert.Equal(@"CREATE TABLE IF NOT EXISTS ""main"".""Sys_User"" (  
+  ""Id"" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
+  ""User_Name"" NVARCHAR(255)
+) 
+;
+", ddl);
+            }
+
+            using (var fsql = new FreeSqlBuilder()
+                .UseConnectionString(DataType.Sqlite, "Data Source=:memory:")
+                .UseNameConvert(NameConvertType.PascalCaseToUnderscoreWithLower)
+                .UseAutoSyncStructure(true)
+                .Build())
+            {
+                fsql.CodeFirst.ConfigEntity<SysUser>(a => { });
+                var ddl = fsql.CodeFirst.GetComparisonDDLStatements<SysUser>();
+                Assert.Equal(@"CREATE TABLE IF NOT EXISTS ""main"".""sys_user"" (  
+  ""id"" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
+  ""user_name"" NVARCHAR(255)
+) 
+;
+", ddl);
+            }
+
+            using (var fsql = new FreeSqlBuilder()
+                .UseConnectionString(DataType.Sqlite, "Data Source=:memory:")
+                .UseNameConvert(NameConvertType.PascalCaseToUnderscoreWithUpper)
+                .UseAutoSyncStructure(true)
+                .Build())
+            {
+                fsql.CodeFirst.ConfigEntity<SysUser>(a => { });
+                var ddl = fsql.CodeFirst.GetComparisonDDLStatements<SysUser>();
+                Assert.Equal(@"CREATE TABLE IF NOT EXISTS ""main"".""SYS_USER"" (  
+  ""ID"" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
+  ""USER_NAME"" NVARCHAR(255)
+) 
+;
+", ddl);
+            }
+
+            using (var fsql = new FreeSqlBuilder()
+                .UseConnectionString(DataType.Sqlite, "Data Source=:memory:")
+                .UseNameConvert(NameConvertType.ToLower)
+                .UseAutoSyncStructure(true)
+                .Build())
+            {
+                fsql.CodeFirst.ConfigEntity<SysUser>(a => { });
+                var ddl = fsql.CodeFirst.GetComparisonDDLStatements<SysUser>();
+                Assert.Equal(@"CREATE TABLE IF NOT EXISTS ""main"".""sysuser"" (  
+  ""id"" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
+  ""username"" NVARCHAR(255)
+) 
+;
+", ddl);
+            }
+
+            using (var fsql = new FreeSqlBuilder()
+                .UseConnectionString(DataType.Sqlite, "Data Source=:memory:")
+                .UseNameConvert(NameConvertType.ToUpper)
+                .UseAutoSyncStructure(true)
+                .Build())
+            {
+                fsql.CodeFirst.ConfigEntity<SysUser>(a => { });
+                var ddl = fsql.CodeFirst.GetComparisonDDLStatements<SysUser>();
+                Assert.Equal(@"CREATE TABLE IF NOT EXISTS ""main"".""SYSUSER"" (  
+  ""ID"" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
+  ""USERNAME"" NVARCHAR(255)
+) 
+;
+", ddl);
+            }
+        }
+
+        public class SysUser
+        {
+            [Column(IsPrimary = true, IsIdentity = true)]
+            public int Id { get; set; }
+
+            public string UserName { get; set; }
+        }
+
+    }
+
+}
diff --git a/FreeSql/Internal/CommonUtils.cs b/FreeSql/Internal/CommonUtils.cs
index 0f42d02e..8ad03191 100644
--- a/FreeSql/Internal/CommonUtils.cs
+++ b/FreeSql/Internal/CommonUtils.cs
@@ -128,7 +128,7 @@ namespace FreeSql.Internal
                             {
                                 ModifyResult = new TableAttribute
                                 {
-                                    Name = attr.Name,
+                                    Name = attr.Name ?? type.Name,
                                     OldName = attr.OldName,
                                     _DisableSyncStructure = attr._DisableSyncStructure,
                                     AsTable = attr.AsTable
@@ -136,7 +136,7 @@ namespace FreeSql.Internal
                             };
                             _orm.Aop.ConfigEntityHandler(_orm, aope); 
                             var tryattr = aope.ModifyResult;
-                            if (!string.IsNullOrEmpty(tryattr.Name)) attr.Name = tryattr.Name;
+                            if (!string.IsNullOrEmpty(tryattr.Name) && tryattr.Name != type.Name) attr.Name = tryattr.Name;
                             if (!string.IsNullOrEmpty(tryattr.OldName)) attr.OldName = tryattr.OldName;
                             if (tryattr._DisableSyncStructure != null) attr._DisableSyncStructure = tryattr.DisableSyncStructure;
                             if (!string.IsNullOrEmpty(tryattr.AsTable)) attr.AsTable = tryattr.AsTable;
@@ -194,7 +194,7 @@ namespace FreeSql.Internal
                             {
                                 ModifyResult = new ColumnAttribute
                                 {
-                                    Name = attr.Name,
+                                    Name = attr.Name ?? proto.Name,
                                     OldName = attr.OldName,
                                     DbType = attr.DbType,
                                     _IsPrimary = attr._IsPrimary,
@@ -217,7 +217,7 @@ namespace FreeSql.Internal
                             };
                             _orm.Aop.ConfigEntityPropertyHandler(_orm, aope);
                             var tryattr = aope.ModifyResult;
-                            if (!string.IsNullOrEmpty(tryattr.Name)) attr.Name = tryattr.Name;
+                            if (!string.IsNullOrEmpty(tryattr.Name) && tryattr.Name != proto.Name) attr.Name = tryattr.Name;
                             if (!string.IsNullOrEmpty(tryattr.OldName)) attr.OldName = tryattr.OldName;
                             if (!string.IsNullOrEmpty(tryattr.DbType)) attr.DbType = tryattr.DbType;
                             if (tryattr._IsPrimary != null) attr._IsPrimary = tryattr.IsPrimary;