diff --git a/FreeSql.Tests/FreeSql.Tests.Provider.MySqlConnector/MySqlConnector/MySqlCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests.Provider.MySqlConnector/MySqlConnector/MySqlCodeFirstTest.cs
index b7ec0ce2..146fcca4 100644
--- a/FreeSql.Tests/FreeSql.Tests.Provider.MySqlConnector/MySqlConnector/MySqlCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests.Provider.MySqlConnector/MySqlConnector/MySqlCodeFirstTest.cs
@@ -11,6 +11,31 @@ namespace FreeSql.Tests.MySqlConnector
 {
     public class MySqlCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.mysql;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void Timestamp01()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs
index a53525b3..50c59a57 100644
--- a/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Dameng/DamengCodeFirstTest.cs
@@ -12,6 +12,31 @@ namespace FreeSql.Tests.Dameng
 {
     public class DamengCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.dameng;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void StringLength36()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/Firebird/FirebirdCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/Firebird/FirebirdCodeFirstTest.cs
index 32ae41b0..9a6165db 100644
--- a/FreeSql.Tests/FreeSql.Tests/Firebird/FirebirdCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Firebird/FirebirdCodeFirstTest.cs
@@ -10,6 +10,31 @@ namespace FreeSql.Tests.Firebird
 {
     public class FirebirdCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.firebird;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void Text_StringLength_1()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/KingbaseES/KingbaseESCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/KingbaseES/KingbaseESCodeFirstTest.cs
index 65197cba..891e89f6 100644
--- a/FreeSql.Tests/FreeSql.Tests/KingbaseES/KingbaseESCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/KingbaseES/KingbaseESCodeFirstTest.cs
@@ -10,6 +10,31 @@ namespace FreeSql.Tests.KingbaseES
 {
     public class KingbaseESCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.kingbaseES;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void StringLength()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/MsAccess/MsAccessCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/MsAccess/MsAccessCodeFirstTest.cs
index 5a6a3941..4956d9d1 100644
--- a/FreeSql.Tests/FreeSql.Tests/MsAccess/MsAccessCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/MsAccess/MsAccessCodeFirstTest.cs
@@ -10,6 +10,31 @@ namespace FreeSql.Tests.MsAccess
 {
     public class MsAccessCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.msaccess;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void StringLength()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/MySql/MySqlCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/MySql/MySqlCodeFirstTest.cs
index 626d726c..35c500f7 100644
--- a/FreeSql.Tests/FreeSql.Tests/MySql/MySqlCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/MySql/MySqlCodeFirstTest.cs
@@ -11,6 +11,31 @@ namespace FreeSql.Tests.MySql
 {
     public class MySqlCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.mysql;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void Timestamp01()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs
index 1ce4f716..76c00e43 100644
--- a/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Oracle/OracleCodeFirstTest.cs
@@ -15,6 +15,31 @@ namespace FreeSql.Tests.Oracle
 {
     public class OracleCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.oracle;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void StringNullToEmpty()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLCodeFirstTest.cs
index bfb8976e..25615b65 100644
--- a/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLCodeFirstTest.cs
@@ -18,6 +18,31 @@ namespace FreeSql.Tests.PostgreSQL
 {
     public class PostgreSQLCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.pgsql;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void DateTime_1()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/ShenTong/ShenTongCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/ShenTong/ShenTongCodeFirstTest.cs
index 2716341e..d03e9fe3 100644
--- a/FreeSql.Tests/FreeSql.Tests/ShenTong/ShenTongCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/ShenTong/ShenTongCodeFirstTest.cs
@@ -13,6 +13,30 @@ namespace FreeSql.Tests.ShenTong
 {
     public class ShenTongCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.shentong;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
 
         [Fact]
         public void StringLength()
diff --git a/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerCodeFirstTest.cs
index fac3b6e9..5099b8ef 100644
--- a/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerCodeFirstTest.cs
@@ -12,6 +12,31 @@ namespace FreeSql.Tests.SqlServer
 {
     public class SqlServerCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.sqlserver;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact] 
         public void EnumStartValue1()
         {
diff --git a/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
index b2a0785f..851b9504 100644
--- a/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
@@ -11,6 +11,31 @@ namespace FreeSql.Tests.Sqlite
 {
     public class SqliteCodeFirstTest
     {
+        [Fact]
+        public void InsertUpdateParameter()
+        {
+            var fsql = g.sqlite;
+            fsql.CodeFirst.SyncStructure<ts_iupstr_bak>();
+            var item = new ts_iupstr { id = Guid.NewGuid(), title = string.Join(",", Enumerable.Range(0, 2000).Select(a => "我是中国人")) };
+            Assert.Equal(1, fsql.Insert(item).ExecuteAffrows());
+            var find = fsql.Select<ts_iupstr>().Where(a => a.id == item.id).First();
+            Assert.NotNull(find);
+            Assert.Equal(find.id, item.id);
+            Assert.Equal(find.title, item.title);
+        }
+        [Table(Name = "ts_iupstr_bak", DisableSyncStructure = true)]
+        class ts_iupstr
+        {
+            public Guid id { get; set; }
+            public string title { get; set; }
+        }
+        class ts_iupstr_bak
+        {
+            public Guid id { get; set; }
+            [Column(StringLength = -1)]
+            public string title { get; set; }
+        }
+
         [Fact]
         public void Blob()
         {
diff --git a/Providers/FreeSql.Provider.Dameng/DamengUtils.cs b/Providers/FreeSql.Provider.Dameng/DamengUtils.cs
index 07400898..f11ade39 100644
--- a/Providers/FreeSql.Provider.Dameng/DamengUtils.cs
+++ b/Providers/FreeSql.Provider.Dameng/DamengUtils.cs
@@ -23,7 +23,7 @@ namespace FreeSql.Dameng
             {
                 case DmDbType.Bit:
                     if (value == null) value = null;
-                    else value = (bool)value == true ? 1 : 0;
+                    else value = (bool) value == true ? 1 : 0;
                     dbtype = DmDbType.Int32;
                     break;
                
diff --git a/Providers/FreeSql.Provider.Firebird/FirebirdUtils.cs b/Providers/FreeSql.Provider.Firebird/FirebirdUtils.cs
index a20c5fbc..8c8a74c9 100644
--- a/Providers/FreeSql.Provider.Firebird/FirebirdUtils.cs
+++ b/Providers/FreeSql.Provider.Firebird/FirebirdUtils.cs
@@ -29,7 +29,7 @@ namespace FreeSql.Firebird
                         break;
                     default:
                         dbtype = dbtype2;
-                        if (col.DbSize != 0) ret.Size = col.DbSize;
+                        //if (col.DbSize != 0) ret.Size = col.DbSize;
                         if (col.DbPrecision != 0) ret.Precision = col.DbPrecision;
                         if (col.DbScale != 0) ret.Scale = col.DbScale;
                         break;
diff --git a/Providers/FreeSql.Provider.MySql/MySqlUtils.cs b/Providers/FreeSql.Provider.MySql/MySqlUtils.cs
index 6d2555bc..b539a1f7 100644
--- a/Providers/FreeSql.Provider.MySql/MySqlUtils.cs
+++ b/Providers/FreeSql.Provider.MySql/MySqlUtils.cs
@@ -34,7 +34,7 @@ namespace FreeSql.MySql
                         break;
                     default:
                         dbtype = dbtype2;
-                        if (col.DbSize != 0) ret.Size = col.DbSize;
+                        //if (col.DbSize != 0) ret.Size = col.DbSize;
                         if (col.DbPrecision != 0) ret.Precision = col.DbPrecision;
                         if (col.DbScale != 0) ret.Scale = col.DbScale;
                         break;
diff --git a/Providers/FreeSql.Provider.MySqlConnector/MySqlConnectorUtils.cs b/Providers/FreeSql.Provider.MySqlConnector/MySqlConnectorUtils.cs
index c8cdabb2..2c710b28 100644
--- a/Providers/FreeSql.Provider.MySqlConnector/MySqlConnectorUtils.cs
+++ b/Providers/FreeSql.Provider.MySqlConnector/MySqlConnectorUtils.cs
@@ -31,7 +31,7 @@ namespace FreeSql.MySql
                     //    break;
                     default:
                         dbtype = dbtype2;
-                        if (col.DbSize != 0) ret.Size = col.DbSize;
+                        //if (col.DbSize != 0) ret.Size = col.DbSize;
                         if (col.DbPrecision != 0) ret.Precision = col.DbPrecision;
                         if (col.DbScale != 0) ret.Scale = col.DbScale;
                         break;
diff --git a/Providers/FreeSql.Provider.Oracle/OracleUtils.cs b/Providers/FreeSql.Provider.Oracle/OracleUtils.cs
index 479d77b4..1953b1f8 100644
--- a/Providers/FreeSql.Provider.Oracle/OracleUtils.cs
+++ b/Providers/FreeSql.Provider.Oracle/OracleUtils.cs
@@ -37,7 +37,7 @@ namespace FreeSql.Oracle
                     case OracleDbType.NVarchar2:
                     case OracleDbType.Decimal:
                         dbtype = dbtype2;
-                        if (col.DbSize != 0) ret.Size = col.DbSize;
+                        //if (col.DbSize != 0) ret.Size = col.DbSize;
                         if (col.DbPrecision != 0) ret.Precision = col.DbPrecision;
                         if (col.DbScale != 0) ret.Scale = col.DbScale;
                         break;
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs
index 71c5f478..795ee7b0 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs
@@ -105,7 +105,7 @@ namespace FreeSql.PostgreSQL
                 if (dbtype != NpgsqlDbType.Unknown)
                 {
                     ret.NpgsqlDbType = dbtype;
-                    if (col.DbSize != 0) ret.Size = col.DbSize;
+                    //if (col.DbSize != 0) ret.Size = col.DbSize;
                     if (col.DbPrecision != 0) ret.Precision = col.DbPrecision;
                     if (col.DbScale != 0) ret.Scale = col.DbScale;
                 }
diff --git a/Providers/FreeSql.Provider.ShenTong/ShenTongUtils.cs b/Providers/FreeSql.Provider.ShenTong/ShenTongUtils.cs
index a413ae16..7b391f3b 100644
--- a/Providers/FreeSql.Provider.ShenTong/ShenTongUtils.cs
+++ b/Providers/FreeSql.Provider.ShenTong/ShenTongUtils.cs
@@ -80,7 +80,7 @@ namespace FreeSql.ShenTong
                 if (dbtype != OscarDbType.Oidvector)
                 {
                     ret.OscarDbType = dbtype;
-                    if (col.DbSize != 0) ret.Size = col.DbSize;
+                    //if (col.DbSize != 0) ret.Size = col.DbSize;
                     if (col.DbPrecision != 0) ret.Precision = col.DbPrecision;
                     if (col.DbScale != 0) ret.Scale = col.DbScale;
                 }
diff --git a/Providers/FreeSql.Provider.SqlServer/SqlServerUtils.cs b/Providers/FreeSql.Provider.SqlServer/SqlServerUtils.cs
index 9295faec..b813f3ad 100644
--- a/Providers/FreeSql.Provider.SqlServer/SqlServerUtils.cs
+++ b/Providers/FreeSql.Provider.SqlServer/SqlServerUtils.cs
@@ -39,7 +39,7 @@ namespace FreeSql.SqlServer
                 if (dbtype != SqlDbType.Variant)
                 {
                     ret.SqlDbType = dbtype;
-                    if (col.DbSize != 0) ret.Size = col.DbSize;
+                    //if (col.DbSize != 0) ret.Size = col.DbSize;
                     if (col.DbPrecision != 0) ret.Precision = col.DbPrecision;
                     if (col.DbScale != 0) ret.Scale = col.DbScale;
                 }