diff --git a/Extensions/FreeSql.Extensions.LazyLoading/FreeSql.Extensions.LazyLoading.csproj b/Extensions/FreeSql.Extensions.LazyLoading/FreeSql.Extensions.LazyLoading.csproj
index 80f24053..60966e88 100644
--- a/Extensions/FreeSql.Extensions.LazyLoading/FreeSql.Extensions.LazyLoading.csproj
+++ b/Extensions/FreeSql.Extensions.LazyLoading/FreeSql.Extensions.LazyLoading.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql 扩展包，可实现【延时加载】属性.</Description>
diff --git a/FreeSql.Tests/FreeSql.Tests.xml b/FreeSql.Tests/FreeSql.Tests.xml
index 55568931..6b525395 100644
--- a/FreeSql.Tests/FreeSql.Tests.xml
+++ b/FreeSql.Tests/FreeSql.Tests.xml
@@ -74,9 +74,9 @@
             
             </summary>		
         </member>
-        <member name="P:FreeSql.Tests.UnitTest1.Templates.Id">
+        <member name="P:FreeSql.Tests.UnitTest1.Templates.Id2">
             <summary>
-            主键，ID
+            测试中文重命名id
             </summary>
         </member>
         <member name="T:FreeSql.Tests.ExamPaper">
diff --git a/FreeSql.Tests/UnitTest1.cs b/FreeSql.Tests/UnitTest1.cs
index 54d3e0d6..6234d919 100644
--- a/FreeSql.Tests/UnitTest1.cs
+++ b/FreeSql.Tests/UnitTest1.cs
@@ -232,14 +232,13 @@ namespace FreeSql.Tests {
 		}
 		public class Templates {
 			/// <summary>
-			/// 主键，ID
+			/// 测试中文重命名id
 			/// </summary>
-			[Column(IsPrimary = true)]
-			public Guid Id { get; set; }
+			[Column(IsPrimary = true, OldName = "Id")]
+			public Guid Id2 { get; set; }
 			public string Title { get; set; }
 			public DateTime AddTime { get; set; } = DateTime.Now;
 			public DateTime EditTime { get; set; }
-			[Column(DbType = "text")]
 			public string Code { get; set; }
 		}
 		public class TaskBuild {
@@ -270,20 +269,20 @@ namespace FreeSql.Tests {
 		[Fact]
 		public void Test1() {
 
-			var dkdkdkd = g.mysql.Select<Templates>().ToList();
+			var dkdkdkd = g.oracle.Select<Templates>().ToList();
 
 
 
-			var testaddlist = new List<NewsArticle>();
-			for(var a = 0; a < 133905; a++) {
-				testaddlist.Add(new NewsArticle {
-					ArticleTitle = "testaddlist_topic" + a,
-					Hits = a,
-				});
-			}
-			g.sqlite.Insert<NewsArticle>(testaddlist)
-				//.NoneParameter()
-				.ExecuteAffrows();
+			//var testaddlist = new List<NewsArticle>();
+			//for(var a = 0; a < 133905; a++) {
+			//	testaddlist.Add(new NewsArticle {
+			//		ArticleTitle = "testaddlist_topic" + a,
+			//		Hits = a,
+			//	});
+			//}
+			//g.sqlite.Insert<NewsArticle>(testaddlist)
+			//	//.NoneParameter()
+			//	.ExecuteAffrows();
 
 
 g.mysql.Aop.ParseExpression = (s, e) => {
diff --git a/FreeSql.Tests/g.cs b/FreeSql.Tests/g.cs
index 6df85b6c..7396b139 100644
--- a/FreeSql.Tests/g.cs
+++ b/FreeSql.Tests/g.cs
@@ -39,6 +39,20 @@ public class g {
 	});
 	public static IFreeSql pgsql => pgsqlLazy.Value;
 
+	static Lazy<IFreeSql> sqlserverLazy = new Lazy<IFreeSql>(() => new FreeSql.FreeSqlBuilder()
+		.UseConnectionString(FreeSql.DataType.SqlServer, "Data Source=.;Integrated Security=True;Initial Catalog=freesqlTest;Pooling=true;Max Pool Size=10")
+		.UseAutoSyncStructure(true)
+		.UseMonitorCommand(
+			cmd => {
+				Trace.WriteLine(cmd.CommandText);
+			}, //监听SQL命令对象，在执行前
+			(cmd, traceLog) => {
+				Console.WriteLine(traceLog);
+			}) //监听SQL命令对象，在执行后
+		.UseLazyLoading(true)
+		.Build());
+	public static IFreeSql sqlserver => sqlserverLazy.Value;
+
 	static Lazy<IFreeSql> oracleLazy = new Lazy<IFreeSql>(() => new FreeSql.FreeSqlBuilder()
 		.UseConnectionString(FreeSql.DataType.Oracle, "user id=user1;password=123456;data source=//127.0.0.1:1521/XE;Pooling=true;Max Pool Size=10")
 		.UseAutoSyncStructure(true)
diff --git a/FreeSql/FreeSql.csproj b/FreeSql/FreeSql.csproj
index cd3eb7be..37ca9137 100644
--- a/FreeSql/FreeSql.csproj
+++ b/FreeSql/FreeSql.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql is the most convenient ORM in dotnet. It supports Mysql, Postgresql, SqlServer, Oracle and Sqlite.</Description>
diff --git a/Providers/FreeSql.Provider.MySql/FreeSql.Provider.MySql.csproj b/Providers/FreeSql.Provider.MySql/FreeSql.Provider.MySql.csproj
index 348ebb56..e27094b4 100644
--- a/Providers/FreeSql.Provider.MySql/FreeSql.Provider.MySql.csproj
+++ b/Providers/FreeSql.Provider.MySql/FreeSql.Provider.MySql.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net452</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql 数据库实现，基于 MySql 5.6</Description>
diff --git a/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs b/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs
index 1c9950c8..8fed3c85 100644
--- a/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs
+++ b/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs
@@ -152,7 +152,8 @@ select
 a.column_name,
 a.column_type,
 case when a.is_nullable = 'YES' then 1 else 0 end 'is_nullable',
-case when locate('auto_increment', a.extra) > 0 then 1 else 0 end 'is_identity'
+case when locate('auto_increment', a.extra) > 0 then 1 else 0 end 'is_identity',
+a.column_comment 'comment'
 from information_schema.columns a
 where a.table_schema in ({0}) and a.table_name in ({1})", tboldname ?? tbname);
 					var ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
@@ -164,7 +165,8 @@ where a.table_schema in ({0}) and a.table_name in ({1})", tboldname ?? tbname);
 							sqlType = a1,
 							is_nullable = string.Concat(a[2]) == "1",
 							is_identity = string.Concat(a[3]) == "1",
-							is_unsigned = string.Concat(a[1]).EndsWith(" unsigned")
+							is_unsigned = string.Concat(a[1]).EndsWith(" unsigned"),
+							comment = string.Concat(a[4])
 						};
 					}, StringComparer.CurrentCultureIgnoreCase);
 
@@ -174,18 +176,22 @@ where a.table_schema in ({0}) and a.table_name in ({1})", tboldname ?? tbname);
 							var isIdentityChanged = tbcol.Attribute.IsIdentity == true && tbcol.Attribute.DbType.IndexOf("AUTO_INCREMENT", StringComparison.CurrentCultureIgnoreCase) == -1;
 							if (tbstruct.TryGetValue(tbcol.Attribute.Name, out var tbstructcol) ||
 								string.IsNullOrEmpty(tbcol.Attribute.OldName) == false && tbstruct.TryGetValue(tbcol.Attribute.OldName, out tbstructcol)) {
+								var isCommentChanged = tbstructcol.comment != (tbcol.Comment ?? "");
 								if ((tbcol.Attribute.DbType.IndexOf(" unsigned", StringComparison.CurrentCultureIgnoreCase) != -1) != tbstructcol.is_unsigned ||
 								tbcol.Attribute.DbType.StartsWith(tbstructcol.sqlType, StringComparison.CurrentCultureIgnoreCase) == false ||
 								tbcol.Attribute.IsNullable != tbstructcol.is_nullable ||
-								tbcol.Attribute.IsIdentity != tbstructcol.is_identity) {
+								tbcol.Attribute.IsIdentity != tbstructcol.is_identity ||
+								isCommentChanged) {
 									sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" MODIFY ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" ").Append(tbcol.Attribute.DbType);
+									if (isCommentChanged) sbalter.Append(" COMMENT ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment ?? ""));
 									if (isIdentityChanged) sbalter.Append(" AUTO_INCREMENT").Append(existsPrimary == null ? "" : ", DROP PRIMARY KEY").Append(", ADD PRIMARY KEY(").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(")");
 									sbalter.Append(";\r\n");
 								}
-								if (tbstructcol.column == tbcol.Attribute.OldName) {
+								if (string.Compare(tbstructcol.column, tbcol.Attribute.OldName, true) == 0) {
 									//修改列名
-									sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" CHANGE COLUMN ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.OldName)).Append(" ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" ").Append(tbcol.Attribute.DbType);
-									if (isIdentityChanged) sb.Append(" AUTO_INCREMENT").Append(existsPrimary == null ? "" : ", DROP PRIMARY KEY").Append(", ADD PRIMARY KEY(").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(")");
+									sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" CHANGE COLUMN ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" ").Append(tbcol.Attribute.DbType);
+									if (isCommentChanged) sbalter.Append(" COMMENT ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment ?? ""));
+									if (isIdentityChanged) sbalter.Append(" AUTO_INCREMENT").Append(existsPrimary == null ? "" : ", DROP PRIMARY KEY").Append(", ADD PRIMARY KEY(").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(")");
 									sbalter.Append(";\r\n");
 								}
 								continue;
@@ -193,6 +199,7 @@ where a.table_schema in ({0}) and a.table_name in ({1})", tboldname ?? tbname);
 							//添加列
 							sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" ADD ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" ").Append(tbcol.Attribute.DbType);
 							if (tbcol.Attribute.IsNullable == false) sbalter.Append(" DEFAULT ").Append(_commonUtils.FormatSql("{0}", tbcol.Attribute.DbDefautValue));
+							if (string.IsNullOrEmpty(tbcol.Comment) == false) sbalter.Append(" COMMENT ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment ?? ""));
 							if (isIdentityChanged) sbalter.Append(" AUTO_INCREMENT").Append(existsPrimary == null ? "" : ", DROP PRIMARY KEY").Append(", ADD PRIMARY KEY(").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(")");
 							sbalter.Append(";\r\n");
 						}
@@ -228,6 +235,7 @@ where a.constraint_schema IN ({0}) and a.table_name IN ({1})", tboldname ?? tbna
 						sb.Append(" \r\n  ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" ");
 						sb.Append(tbcol.Attribute.DbType);
 						if (tbcol.Attribute.IsIdentity == true && tbcol.Attribute.DbType.IndexOf("AUTO_INCREMENT", StringComparison.CurrentCultureIgnoreCase) == -1) sb.Append(" AUTO_INCREMENT");
+						if (string.IsNullOrEmpty(tbcol.Comment) == false) sb.Append(" COMMENT ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment));
 						sb.Append(",");
 					}
 					if (tb.Primarys.Any()) {
diff --git a/Providers/FreeSql.Provider.MySqlConnector/FreeSql.Provider.MySqlConnector.csproj b/Providers/FreeSql.Provider.MySqlConnector/FreeSql.Provider.MySqlConnector.csproj
index 667ae1e4..5c4526ac 100644
--- a/Providers/FreeSql.Provider.MySqlConnector/FreeSql.Provider.MySqlConnector.csproj
+++ b/Providers/FreeSql.Provider.MySqlConnector/FreeSql.Provider.MySqlConnector.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql 数据库实现，基于 MySql 5.6</Description>
diff --git a/Providers/FreeSql.Provider.Oracle/FreeSql.Provider.Oracle.csproj b/Providers/FreeSql.Provider.Oracle/FreeSql.Provider.Oracle.csproj
index 9b5064d8..d3155615 100644
--- a/Providers/FreeSql.Provider.Oracle/FreeSql.Provider.Oracle.csproj
+++ b/Providers/FreeSql.Provider.Oracle/FreeSql.Provider.Oracle.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql 数据库实现，基于 Oracle 11</Description>
diff --git a/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs b/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs
index 6893b677..7d59e1c1 100644
--- a/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs
@@ -112,6 +112,11 @@ namespace FreeSql.Oracle {
 						}
 						sb.Remove(sb.Length - 1, 1);
 						sb.Append("\r\n) \r\nLOGGING \r\nNOCOMPRESS \r\nNOCACHE\r\n';\r\n");
+						//备注
+						foreach (var tbcol in tb.Columns.Values) {
+							if (string.IsNullOrEmpty(tbcol.Comment) == false)
+								sb.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment).Replace("'", "''")).Append("';\r\n");
+						}
 						continue;
 					}
 					//如果新表，旧表在一个模式下，直接修改表名
@@ -127,17 +132,19 @@ namespace FreeSql.Oracle {
 				//对比字段，只可以修改类型、增加字段、有限的修改字段名；保证安全不删除字段
 				var sql = _commonUtils.FormatSql($@"
 select 
-column_name,
-data_type,
-data_length,
-data_precision,
-data_scale,
-char_used,
-case when nullable = 'Y' then 1 else 0 end,
-nvl((select 1 from user_sequences where sequence_name='{Utils.GetCsName((tboldname ?? tbname).Last())}_seq_'||all_tab_columns.column_name), 0),
-nvl((select 1 from user_triggers where trigger_name='{Utils.GetCsName((tboldname ?? tbname).Last())}_seq_'||all_tab_columns.column_name||'TI'), 0)
-from all_tab_columns
-where owner={{0}} and table_name={{1}}", tboldname ?? tbname);
+a.column_name,
+a.data_type,
+a.data_length,
+a.data_precision,
+a.data_scale,
+a.char_used,
+case when a.nullable = 'Y' then 1 else 0 end,
+nvl((select 1 from user_sequences where sequence_name='{Utils.GetCsName((tboldname ?? tbname).Last())}_seq_'||a.column_name), 0),
+nvl((select 1 from user_triggers where trigger_name='{Utils.GetCsName((tboldname ?? tbname).Last())}_seq_'||a.column_name||'TI'), 0),
+b.comments
+from all_tab_columns a
+left join all_col_comments b on b.owner = a.owner and b.table_name = a.table_name and b.column_name = a.column_name
+where a.owner={{0}} and a.table_name={{1}}", tboldname ?? tbname);
 				var ds = _orm.Ado.ExecuteArray(CommandType.Text, sql);
 				var tbstruct = ds.ToDictionary(a => string.Concat(a[0]), a => {
 					var sqlType = GetOracleSqlTypeFullName(a);
@@ -145,7 +152,8 @@ where owner={{0}} and table_name={{1}}", tboldname ?? tbname);
 						column = string.Concat(a[0]),
 						sqlType,
 						is_nullable = string.Concat(a[6]) == "1",
-						is_identity = string.Concat(a[7]) == "1" && string.Concat(a[8]) == "1"
+						is_identity = string.Concat(a[7]) == "1" && string.Concat(a[8]) == "1",
+						comment = string.Concat(a[9])
 					};
 				}, StringComparer.CurrentCultureIgnoreCase);
 
@@ -153,7 +161,8 @@ where owner={{0}} and table_name={{1}}", tboldname ?? tbname);
 					foreach (var tbcol in tb.Columns.Values) {
 						var dbtypeNoneNotNull = Regex.Replace(tbcol.Attribute.DbType, @"NOT\s+NULL", "NULL");
 						if (tbstruct.TryGetValue(tbcol.Attribute.Name, out var tbstructcol) ||
-						string.IsNullOrEmpty(tbcol.Attribute.OldName) == false && tbstruct.TryGetValue(tbcol.Attribute.OldName, out tbstructcol)) {
+							string.IsNullOrEmpty(tbcol.Attribute.OldName) == false && tbstruct.TryGetValue(tbcol.Attribute.OldName, out tbstructcol)) {
+							var isCommentChanged = tbstructcol.comment != (tbcol.Comment ?? "");
 							if (tbcol.Attribute.DbType.StartsWith(tbstructcol.sqlType, StringComparison.CurrentCultureIgnoreCase) == false)
 								istmpatler = true;
 								//sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" MODIFY (").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" ").Append(dbtypeNoneNotNull).Append(")';\r\n");
@@ -164,9 +173,11 @@ where owner={{0}} and table_name={{1}}", tboldname ?? tbname);
 							}
 							if (tbcol.Attribute.IsIdentity != tbstructcol.is_identity)
 								seqcols.Add((tbcol, tbname, tbcol.Attribute.IsIdentity == true));
-							if (tbstructcol.column == tbcol.Attribute.OldName)
+							if (string.Compare(tbstructcol.column, tbcol.Attribute.OldName, true) == 0)
 								//修改列名
-								sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" RENAME ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.OldName)).Append(" TO ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append("';\r\n");
+								sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" RENAME COLUMN ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" TO ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append("';\r\n");
+							if (isCommentChanged)
+								sbalter.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment ?? "").Replace("'", "''")).Append("';\r\n");
 							continue;
 						}
 						//添加列
@@ -176,6 +187,7 @@ where owner={{0}} and table_name={{1}}", tboldname ?? tbname);
 							sbalter.Append("execute immediate 'ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" MODIFY ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" NOT NULL';\r\n");
 						}
 						if (tbcol.Attribute.IsIdentity == true) seqcols.Add((tbcol, tbname, tbcol.Attribute.IsIdentity == true));
+						if (string.IsNullOrEmpty(tbcol.Comment) == false) sbalter.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment ?? "").Replace("'", "''")).Append("';\r\n");
 					}
 					var dsuksql = _commonUtils.FormatSql(@"
 select
@@ -231,6 +243,11 @@ and a.owner in ({0}) and a.table_name in ({1})", tboldname ?? tbname);
 				}
 				sb.Remove(sb.Length - 1, 1);
 				sb.Append("\r\n) LOGGING \r\nNOCOMPRESS \r\nNOCACHE\r\n';\r\n");
+				//备注
+				foreach (var tbcol in tb.Columns.Values) {
+					if (string.IsNullOrEmpty(tbcol.Comment) == false)
+						sb.Append("execute immediate 'COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.FTmp_{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment).Replace("'", "''")).Append("';\r\n");
+				}
 				sb.Append("execute immediate 'INSERT INTO ").Append(tmptablename).Append(" (");
 				foreach (var tbcol in tb.Columns.Values)
 					sb.Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(", ");
diff --git a/Providers/FreeSql.Provider.Oracle/OracleDbFirst.cs b/Providers/FreeSql.Provider.Oracle/OracleDbFirst.cs
index 087580ad..4d008622 100644
--- a/Providers/FreeSql.Provider.Oracle/OracleDbFirst.cs
+++ b/Providers/FreeSql.Provider.Oracle/OracleDbFirst.cs
@@ -199,7 +199,7 @@ a.data_length,
 a.data_precision,
 a.data_scale,
 a.char_used,
-case when nullable = 'Y' then 1 else 0 end,
+case when a.nullable = 'Y' then 1 else 0 end,
 nvl((select 1 from user_sequences where upper(sequence_name)=upper(a.table_name||'_seq_'||a.column_name)), 0),
 b.comments
 from all_tab_cols a
diff --git a/Providers/FreeSql.Provider.PostgreSQL/FreeSql.Provider.PostgreSQL.csproj b/Providers/FreeSql.Provider.PostgreSQL/FreeSql.Provider.PostgreSQL.csproj
index e2ff1e19..d9e23606 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/FreeSql.Provider.PostgreSQL.csproj
+++ b/Providers/FreeSql.Provider.PostgreSQL/FreeSql.Provider.PostgreSQL.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql 数据库实现，基于 PostgreSQL 9.5</Description>
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
index 4568a53f..708f73a3 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
@@ -155,6 +155,11 @@ namespace FreeSql.PostgreSQL {
 						}
 						sb.Remove(sb.Length - 1, 1);
 						sb.Append("\r\n) WITH (OIDS=FALSE);\r\n");
+						//备注
+						foreach (var tbcol in tb.Columns.Values) {
+							if (string.IsNullOrEmpty(tbcol.Comment) == false)
+								sb.Append("COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment)).Append(";\r\n");
+						}
 						continue;
 					}
 					//如果新表，旧表在一个数据库和模式下，直接修改表名
@@ -176,7 +181,8 @@ case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.at
 case when t.typelem > 0 and t.typinput::varchar = 'array_in' then t2.typname else t.typname end,
 case when a.attnotnull then '0' else '1' end as is_nullable,
 e.adsrc,
-a.attndims
+a.attndims,
+d.description as comment
 from pg_class c
 inner join pg_attribute a on a.attnum > 0 and a.attrelid = c.oid
 inner join pg_type t on t.oid = a.atttypid
@@ -207,7 +213,8 @@ where ns.nspname = {0} and c.relname = {1}", tboldname ?? tbname);
 						max_length = long.Parse(string.Concat(a[2])),
 						is_nullable = string.Concat(a[4]) == "1",
 						is_identity = string.Concat(a[5]).StartsWith(@"nextval('") && string.Concat(a[5]).EndsWith(@"'::regclass)"),
-						attndims
+						attndims,
+						comment = string.Concat(a[7])
 					};
 					}, StringComparer.CurrentCultureIgnoreCase);
 
@@ -215,6 +222,7 @@ where ns.nspname = {0} and c.relname = {1}", tboldname ?? tbname);
 					foreach (var tbcol in tb.Columns.Values) {
 						if (tbstruct.TryGetValue(tbcol.Attribute.Name, out var tbstructcol) ||
 							string.IsNullOrEmpty(tbcol.Attribute.OldName) == false && tbstruct.TryGetValue(tbcol.Attribute.OldName, out tbstructcol)) {
+							var isCommentChanged = tbstructcol.comment != (tbcol.Comment ?? "");
 							if (tbcol.Attribute.DbType.StartsWith(tbstructcol.sqlType, StringComparison.CurrentCultureIgnoreCase) == false ||
 								tbcol.Attribute.DbType.Contains("[]") != (tbstructcol.attndims > 0))
 								sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" ALTER COLUMN ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" TYPE ").Append(tbcol.Attribute.DbType.Split(' ').First()).Append(";\r\n");
@@ -222,9 +230,11 @@ where ns.nspname = {0} and c.relname = {1}", tboldname ?? tbname);
 								sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" ALTER COLUMN ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" ").Append(tbcol.Attribute.IsNullable == true ? "DROP" : "SET").Append(" NOT NULL;\r\n");
 							if (tbcol.Attribute.IsIdentity != tbstructcol.is_identity)
 								seqcols.Add((tbcol, tbname, tbcol.Attribute.IsIdentity == true));
-							if (tbstructcol.column == tbcol.Attribute.OldName)
+							if (string.Compare(tbstructcol.column, tbcol.Attribute.OldName, true) == 0)
 								//修改列名
-								sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" RENAME COLUMN ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.OldName)).Append(" TO ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(";\r\n");
+								sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" RENAME COLUMN ").Append(_commonUtils.QuoteSqlName(tbstructcol.column)).Append(" TO ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(";\r\n");
+							if (isCommentChanged)
+								sbalter.Append("COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment)).Append(";\r\n");
 							continue;
 						}
 						//添加列
@@ -232,6 +242,7 @@ where ns.nspname = {0} and c.relname = {1}", tboldname ?? tbname);
 						sbalter.Append("UPDATE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" SET ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" = ").Append(_commonUtils.FormatSql("{0};\r\n", tbcol.Attribute.DbDefautValue));
 						if (tbcol.Attribute.IsNullable == false) sbalter.Append("ALTER TABLE ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}")).Append(" ALTER COLUMN ").Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(" SET NOT NULL;\r\n");
 						if (tbcol.Attribute.IsIdentity == true) seqcols.Add((tbcol, tbname, tbcol.Attribute.IsIdentity == true));
+						if (string.IsNullOrEmpty(tbcol.Comment) == false) sbalter.Append("COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment)).Append(";\r\n");
 					}
 					var dsuksql = _commonUtils.FormatSql(@"
 select
@@ -288,6 +299,11 @@ where pg_namespace.nspname={0} and pg_class.relname={1} and pg_constraint.contyp
 				}
 				sb.Remove(sb.Length - 1, 1);
 				sb.Append("\r\n) WITH (OIDS=FALSE);\r\n");
+				//备注
+				foreach (var tbcol in tb.Columns.Values) {
+					if (string.IsNullOrEmpty(tbcol.Comment) == false)
+						sb.Append("COMMENT ON COLUMN ").Append(_commonUtils.QuoteSqlName($"{tbname[0]}.FreeSqlTmp_{tbname[1]}.{tbcol.Attribute.Name}")).Append(" IS ").Append(_commonUtils.FormatSql("{0}", tbcol.Comment)).Append(";\r\n");
+				}
 				sb.Append("INSERT INTO ").Append(tmptablename).Append(" (");
 				foreach (var tbcol in tb.Columns.Values)
 					sb.Append(_commonUtils.QuoteSqlName(tbcol.Attribute.Name)).Append(", ");
diff --git a/Providers/FreeSql.Provider.SqlServer/FreeSql.Provider.SqlServer.csproj b/Providers/FreeSql.Provider.SqlServer/FreeSql.Provider.SqlServer.csproj
index 0546a070..6a700bf8 100644
--- a/Providers/FreeSql.Provider.SqlServer/FreeSql.Provider.SqlServer.csproj
+++ b/Providers/FreeSql.Provider.SqlServer/FreeSql.Provider.SqlServer.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net451</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql 数据库实现，基于 SqlServer 2005+，并根据版本适配分页方法：row_number 或 offset fetch next</Description>
diff --git a/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs b/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs
index 1356b66f..6df8fd72 100644
--- a/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs
+++ b/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs
@@ -63,7 +63,37 @@ namespace FreeSql.SqlServer {
 			}
 			return null;
 		}
-		
+
+		void AddOrUpdateMS_Description(StringBuilder sb, string schema, string table, string column, string comment) {
+			if (string.IsNullOrEmpty(comment)) {
+				sb.AppendFormat(@"
+IF ((SELECT COUNT(1) from fn_listextendedproperty('MS_Description', 
+  'SCHEMA', N'{0}', 
+  'TABLE', N'{1}', 
+  'COLUMN', N'{2}')) > 0) 
+  EXEC sp_dropextendedproperty @name = N'MS_Description'
+    , @level0type = 'SCHEMA', @level0name = N'{0}'
+    , @level1type = 'TABLE', @level1name = N'{1}'
+    , @level2type = 'COLUMN', @level2name = N'{2}'
+", schema.Replace("'", "''"), table.Replace("'", "''"), column.Replace("'", "''"));
+				return;
+			}
+			sb.AppendFormat(@"
+IF ((SELECT COUNT(1) from fn_listextendedproperty('MS_Description', 
+  'SCHEMA', N'{0}', 
+  'TABLE', N'{1}', 
+  'COLUMN', N'{2}')) > 0) 
+  EXEC sp_updateextendedproperty @name = N'MS_Description', @value = N'{3}'
+    , @level0type = 'SCHEMA', @level0name = N'{0}'
+    , @level1type = 'TABLE', @level1name = N'{1}'
+    , @level2type = 'COLUMN', @level2name = N'{2}'
+ELSE
+  EXEC sp_addextendedproperty @name = N'MS_Description', @value = N'{3}'
+    , @level0type = 'SCHEMA', @level0name = N'{0}'
+    , @level1type = 'TABLE', @level1name = N'{1}'
+    , @level2type = 'COLUMN', @level2name = N'{2}'
+", schema.Replace("'", "''"), table.Replace("'", "''"), column.Replace("'", "''"), comment?.Replace("'", "''") ?? "");
+		}
 		public override string GetComparisonDDLStatements(params Type[] entityTypes) {
 			var conn = _orm.Ado.MasterPool.Get(TimeSpan.FromSeconds(5));
 			var database = conn.Value.Database;
@@ -133,6 +163,11 @@ namespace FreeSql.SqlServer {
 								sb.Remove(sb.Length - 2, 2).Append("),");
 							}
 							sb.Remove(sb.Length - 1, 1).Append("\r\n);\r\n");
+							//备注
+							foreach (var tbcol in tb.Columns.Values) {
+								if (string.IsNullOrEmpty(tbcol.Comment) == false)
+									AddOrUpdateMS_Description(sb, tbname[1], tbname[2], tbcol.Attribute.Name, tbcol.Comment);
+							}
 							continue;
 						}
 						//如果新表，旧表在一个数据库和模式下，直接修改表名
@@ -160,6 +195,7 @@ a.name 'Column'
  else '' end as 'SqlType'
 ,case when a.is_nullable = 1 then '1' else '0' end 'IsNullable'
 ,case when a.is_identity = 1 then '1' else '0' end 'IsIdentity'
+,c.value
 from sys.columns a
 inner join sys.types b on b.user_type_id = a.user_type_id
 left join sys.extended_properties AS c ON c.major_id = a.object_id AND c.minor_id = a.column_id
@@ -172,23 +208,27 @@ use " + database, tboldname ?? tbname);
 						column = string.Concat(a[0]),
 						sqlType = string.Concat(a[1]),
 						is_nullable = string.Concat(a[2]) == "1",
-						is_identity = string.Concat(a[3]) == "1"
+						is_identity = string.Concat(a[3]) == "1",
+						comment = string.Concat(a[4])
 					}, StringComparer.CurrentCultureIgnoreCase);
 
 					if (istmpatler == false) {
 						foreach (var tbcol in tb.Columns.Values) {
 							if (tbstruct.TryGetValue(tbcol.Attribute.Name, out var tbstructcol) ||
 								string.IsNullOrEmpty(tbcol.Attribute.OldName) == false && tbstruct.TryGetValue(tbcol.Attribute.OldName, out tbstructcol)) {
+								var isCommentChanged = tbstructcol.comment != (tbcol.Comment ?? "");
 								if (tbcol.Attribute.DbType.StartsWith(tbstructcol.sqlType, StringComparison.CurrentCultureIgnoreCase) == false ||
 									tbcol.Attribute.IsNullable != tbstructcol.is_nullable ||
 									tbcol.Attribute.IsIdentity != tbstructcol.is_identity) {
 									istmpatler = true;
 									break;
 								}
-								if (tbstructcol.column == tbcol.Attribute.OldName) {
+								if (string.Compare(tbstructcol.column, tbcol.Attribute.OldName, true) == 0)
 									//修改列名
-									sbalter.Append(_commonUtils.FormatSql("EXEC sp_rename {0}, {1}, 'COLUMN';\r\n", $"{tbname[0]}.{tbname[1]}.{tbname[2]}.{tbcol.Attribute.OldName}", tbcol.Attribute.Name));
-								}
+									sbalter.Append(_commonUtils.FormatSql("EXEC sp_rename {0}, {1}, 'COLUMN';\r\n", $"{tbname[0]}.{tbname[1]}.{tbname[2]}.{tbstructcol.column}", tbcol.Attribute.Name));
+								if (isCommentChanged)
+									//修改备备注
+									AddOrUpdateMS_Description(sbalter, tbname[1], tbname[2], tbcol.Attribute.Name, tbcol.Comment);
 								continue;
 							}
 							//添加列
@@ -199,6 +239,7 @@ use " + database, tboldname ?? tbname);
 								if (addcoldbdefault != null) sbalter.Append(_commonUtils.FormatSql(" default({0})", addcoldbdefault));
 							}
 							sbalter.Append(";\r\n");
+							if (string.IsNullOrEmpty(tbcol.Comment) == false) AddOrUpdateMS_Description(sbalter, tbname[1], tbname[2], tbcol.Attribute.Name, tbcol.Comment);
 						}
 						var dsuksql = string.Format(@"
 use [{0}];
@@ -265,6 +306,11 @@ use " + database, tboldname ?? tbname);
 						sb.Remove(sb.Length - 2, 2).Append("),");
 					}
 					sb.Remove(sb.Length - 1, 1).Append("\r\n);\r\n");
+					//备注
+					foreach (var tbcol in tb.Columns.Values) {
+						if (string.IsNullOrEmpty(tbcol.Comment) == false)
+							AddOrUpdateMS_Description(sb, tbname[1], $"FreeSqlTmp_{tbname[2]}", tbcol.Attribute.Name, tbcol.Comment);
+					}
 					sb.Append("ALTER TABLE ").Append(tmptablename).Append(" SET (LOCK_ESCALATION = TABLE);\r\n");
 					if (idents) sb.Append("SET IDENTITY_INSERT ").Append(tmptablename).Append(" ON;\r\n");
 					sb.Append("IF EXISTS(SELECT 1 FROM ").Append(tablename).Append(")\r\n");
diff --git a/Providers/FreeSql.Provider.Sqlite/FreeSql.Provider.Sqlite.csproj b/Providers/FreeSql.Provider.Sqlite/FreeSql.Provider.Sqlite.csproj
index a53f4f70..8bc42afb 100644
--- a/Providers/FreeSql.Provider.Sqlite/FreeSql.Provider.Sqlite.csproj
+++ b/Providers/FreeSql.Provider.Sqlite/FreeSql.Provider.Sqlite.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
-		<Version>0.6.10</Version>
+		<Version>0.6.11</Version>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<Authors>YeXiangQin</Authors>
 		<Description>FreeSql 数据库实现，基于 Sqlite 3.0</Description>
diff --git a/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs b/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs
index e3fdc8c5..e3488b89 100644
--- a/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs
@@ -152,7 +152,7 @@ namespace FreeSql.Sqlite {
 								istmpatler = true;
 							if (tbcol.Attribute.IsIdentity != tbstructcol.is_identity)
 								istmpatler = true;
-							if (tbstructcol.column == tbcol.Attribute.OldName)
+							if (string.Compare(tbstructcol.column, tbcol.Attribute.OldName, true) == 0)
 								//修改列名
 								istmpatler = true;
 							continue;