diff --git a/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs b/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
index d697b47c..e8084e14 100644
--- a/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Sqlite/SqliteCodeFirstTest.cs
@@ -371,6 +371,11 @@ namespace FreeSql.Tests.Sqlite
             public TableAllTypeEnumType1? Enum1Nullable { get; set; }
             public TableAllTypeEnumType2 Enum2 { get; set; }
             public TableAllTypeEnumType2? Enum2Nullable { get; set; }
+
+            public TableAllTypeEnumType3 testFieldEnum3 { get; set; }
+            public TableAllTypeEnumType3? testFieldEnum3Nullable { get; set; }
+
+            public enum TableAllTypeEnumType3 { }
         }
 
         public enum TableAllTypeEnumType1 { e1, e2, e3, e5 }
diff --git a/FreeSql.Tests/FreeSql.Tests/g.cs b/FreeSql.Tests/FreeSql.Tests/g.cs
index 7ba71c68..79f636fc 100644
--- a/FreeSql.Tests/FreeSql.Tests/g.cs
+++ b/FreeSql.Tests/FreeSql.Tests/g.cs
@@ -109,7 +109,7 @@ public class g
 
     static Lazy<IFreeSql> damengLazy = new Lazy<IFreeSql>(() => new FreeSql.FreeSqlBuilder()
         .UseConnectionString(FreeSql.DataType.Dameng, "server=127.0.0.1;port=5236;user id=2user;password=123456789;database=2user;poolsize=5")
-         //.UseConnectionFactory(FreeSql.DataType.Dameng, () => new Dm.DmConnection("data source=127.0.0.1:5236;user id=2user;password=123456789;Pooling=true;Max Pool Size=2"))
+         //.UseConnectionFactory(FreeSql.DataType.Dameng, () => new Dm.DmConnection("data source=127.0.0.1:5236;user id=2user;password=123456789;Pooling=true;poolsize=2"))
          .UseAutoSyncStructure(true)
         .UseLazyLoading(true)
         .UseNameConvert(FreeSql.Internal.NameConvertType.ToUpper)
diff --git a/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs b/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs
index 2378e7ab..d039e15d 100644
--- a/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Dameng/DamengCodeFirst.cs
@@ -60,8 +60,8 @@ namespace FreeSql.Dameng
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(DmDbType.Int32, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(DmDbType.Int64, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(DmDbType.Int32, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(DmDbType.Int64, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.MsAccess/MsAccessCodeFirst.cs b/Providers/FreeSql.Provider.MsAccess/MsAccessCodeFirst.cs
index 2033b34b..a78a56ea 100644
--- a/Providers/FreeSql.Provider.MsAccess/MsAccessCodeFirst.cs
+++ b/Providers/FreeSql.Provider.MsAccess/MsAccessCodeFirst.cs
@@ -56,8 +56,8 @@ namespace FreeSql.MsAccess
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OleDbType.BigInt, "decimal", $"decimal(20,0){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OleDbType.Integer, "decimal", $"decimal(11,0){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OleDbType.BigInt, "decimal", $"decimal(20,0){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OleDbType.Integer, "decimal", $"decimal(11,0){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs b/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs
index e48d751f..76ba3291 100644
--- a/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs
+++ b/Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs
@@ -64,8 +64,8 @@ namespace FreeSql.MySql
             {
                 var names = string.Join(",", Enum.GetNames(enumType).Select(a => _commonUtils.FormatSql("{0}", a)));
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(MySqlDbType.Set, "set", $"set({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(MySqlDbType.Enum, "enum", $"enum({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(MySqlDbType.Set, "set", $"set({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(MySqlDbType.Enum, "enum", $"enum({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengCodeFirst.cs
index 55fc2af3..da91867c 100644
--- a/Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/Dameng/OdbcDamengCodeFirst.cs
@@ -60,8 +60,8 @@ namespace FreeSql.Odbc.Dameng
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OdbcType.Int, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OdbcType.BigInt, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OdbcType.Int, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OdbcType.BigInt, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Odbc/Default/OdbcCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/Default/OdbcCodeFirst.cs
index 26e218a9..5d758171 100644
--- a/Providers/FreeSql.Provider.Odbc/Default/OdbcCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/Default/OdbcCodeFirst.cs
@@ -74,8 +74,8 @@ namespace FreeSql.Odbc.Default
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OdbcType.BigInt, _utils.Adapter.MappingOdbcTypeBigInt, $"{_utils.Adapter.MappingOdbcTypeBigInt}{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OdbcType.Int, _utils.Adapter.MappingOdbcTypeInt, $"{_utils.Adapter.MappingOdbcTypeInt}{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OdbcType.BigInt, _utils.Adapter.MappingOdbcTypeBigInt, $"{_utils.Adapter.MappingOdbcTypeBigInt}{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OdbcType.Int, _utils.Adapter.MappingOdbcTypeInt, $"{_utils.Adapter.MappingOdbcTypeInt}{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Odbc/MySql/OdbcMySqlCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/MySql/OdbcMySqlCodeFirst.cs
index 3e389fb6..7b976b31 100644
--- a/Providers/FreeSql.Provider.Odbc/MySql/OdbcMySqlCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/MySql/OdbcMySqlCodeFirst.cs
@@ -57,8 +57,8 @@ namespace FreeSql.Odbc.MySql
             {
                 var names = string.Join(",", Enum.GetNames(enumType).Select(a => _commonUtils.FormatSql("{0}", a)));
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OdbcType.VarChar, "set", $"set({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OdbcType.VarChar, "enum", $"enum({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OdbcType.VarChar, "set", $"set({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OdbcType.VarChar, "enum", $"enum({names}){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Odbc/Oracle/OdbcOracleCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/Oracle/OdbcOracleCodeFirst.cs
index a898f956..cf3b5b64 100644
--- a/Providers/FreeSql.Provider.Odbc/Oracle/OdbcOracleCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/Oracle/OdbcOracleCodeFirst.cs
@@ -60,8 +60,8 @@ namespace FreeSql.Odbc.Oracle
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OdbcType.Int, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OdbcType.BigInt, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OdbcType.Int, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OdbcType.BigInt, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
index 71e3322a..734a0e25 100644
--- a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
@@ -64,8 +64,8 @@ namespace FreeSql.Odbc.PostgreSQL
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OdbcType.Int, "int8", $"int8{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OdbcType.BigInt, "int4", $"int4{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OdbcType.Int, "int8", $"int8{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OdbcType.BigInt, "int4", $"int4{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLUtils.cs b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLUtils.cs
index 9b582199..f6aa1295 100644
--- a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLUtils.cs
+++ b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLUtils.cs
@@ -50,8 +50,8 @@ namespace FreeSql.Odbc.PostgreSQL
                     if (genericTypesFirst.IsEnum) enumType = genericTypesFirst;
                 }
                 if (enumType != null) return enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    getParamterArrayValue(typeof(long), value, elementType.IsEnum ? null : Enum.GetValues(enumType).GetValue(0)) :
-                    getParamterArrayValue(typeof(int), value, elementType.IsEnum ? null : Enum.GetValues(enumType).GetValue(0));
+                    getParamterArrayValue(typeof(long), value, elementType.IsEnum ? null : enumType.CreateInstanceGetDefaultValue()) :
+                    getParamterArrayValue(typeof(int), value, elementType.IsEnum ? null : enumType.CreateInstanceGetDefaultValue());
                 return dicGetParamterValue.TryGetValue(type.FullName, out var trydicarr) ? trydicarr(value) : value;
             }
             if (type.IsNullableType()) type = type.GetGenericArguments().First();
diff --git a/Providers/FreeSql.Provider.Odbc/SqlServer/OdbcSqlServerCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/SqlServer/OdbcSqlServerCodeFirst.cs
index 550903f3..0f552451 100644
--- a/Providers/FreeSql.Provider.Odbc/SqlServer/OdbcSqlServerCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/SqlServer/OdbcSqlServerCodeFirst.cs
@@ -56,8 +56,8 @@ namespace FreeSql.Odbc.SqlServer
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OdbcType.BigInt, "bigint", $"bigint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OdbcType.Int, "int", $"int{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OdbcType.BigInt, "bigint", $"bigint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OdbcType.Int, "int", $"int{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs b/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs
index 132219f0..8a8abe9d 100644
--- a/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Oracle/OracleCodeFirst.cs
@@ -61,8 +61,8 @@ namespace FreeSql.Oracle
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(OracleDbType.Int32, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(OracleDbType.Int64, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(OracleDbType.Int32, "number", $"number(16){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(OracleDbType.Int64, "number", $"number(32){(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
index 7e714a49..fa581e60 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
@@ -99,8 +99,8 @@ namespace FreeSql.PostgreSQL
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(NpgsqlDbType.Bigint, "int8", $"int8{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(NpgsqlDbType.Integer, "int4", $"int4{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(NpgsqlDbType.Bigint, "int8", $"int8{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(NpgsqlDbType.Integer, "int4", $"int4{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs
index cc345caa..c32ee8db 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLUtils.cs
@@ -68,8 +68,8 @@ namespace FreeSql.PostgreSQL
                 if (elementType.IsEnum) enumType = elementType;
                 else if (elementType.IsNullableType() && elementType.GenericTypeArguments.First().IsEnum) enumType = elementType.GenericTypeArguments.First();
                 if (enumType != null) return enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    getParamterArrayValue(typeof(long), value, elementType.IsEnum ? null : Enum.GetValues(enumType).GetValue(0)) :
-                    getParamterArrayValue(typeof(int), value, elementType.IsEnum ? null : Enum.GetValues(enumType).GetValue(0));
+                    getParamterArrayValue(typeof(long), value, elementType.IsEnum ? null : enumType.CreateInstanceGetDefaultValue()) :
+                    getParamterArrayValue(typeof(int), value, elementType.IsEnum ? null : enumType.CreateInstanceGetDefaultValue());
                 return dicGetParamterValue.TryGetValue(type.FullName, out var trydicarr) ? trydicarr(value) : value;
             }
             if (type.IsNullableType()) type = type.GenericTypeArguments.First();
diff --git a/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs b/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs
index 2d30c5ba..4eaa1476 100644
--- a/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs
+++ b/Providers/FreeSql.Provider.SqlServer/SqlServerCodeFirst.cs
@@ -55,8 +55,8 @@ namespace FreeSql.SqlServer
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(SqlDbType.BigInt, "bigint", $"bigint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(SqlDbType.Int, "int", $"int{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(SqlDbType.BigInt, "bigint", $"bigint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(SqlDbType.Int, "int", $"int{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)
diff --git a/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs b/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs
index b6ed95d0..eb267acb 100644
--- a/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Sqlite/SqliteCodeFirst.cs
@@ -55,8 +55,8 @@ namespace FreeSql.Sqlite
             if (enumType != null)
             {
                 var newItem = enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Any() ?
-                    CsToDb.New(DbType.Int64, "bigint", $"bigint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0)) :
-                    CsToDb.New(DbType.Int32, "mediumint", $"mediumint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, Enum.GetValues(enumType).GetValue(0));
+                    CsToDb.New(DbType.Int64, "bigint", $"bigint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue()) :
+                    CsToDb.New(DbType.Int32, "mediumint", $"mediumint{(type.IsEnum ? " NOT NULL" : "")}", false, type.IsEnum ? false : true, enumType.CreateInstanceGetDefaultValue());
                 if (_dicCsToDb.ContainsKey(type.FullName) == false)
                 {
                     lock (_dicCsToDbLock)