diff --git a/dialect_mssql.go b/dialect_mssql.go
index 29070da2..5ef870d3 100644
--- a/dialect_mssql.go
+++ b/dialect_mssql.go
@@ -244,7 +244,7 @@ func (db *mssql) SqlType(c *core.Column) string {
 		c.Length = 7
 	case core.MediumInt:
 		res = core.Int
-	case core.Text, core.MediumText, core.TinyText, core.LongText, core.Json:
+	case core.Text, core.MediumText, core.TinyText, core.LongText:
 		res = core.Varchar + "(MAX)"
 	case core.Double:
 		res = core.Real
diff --git a/dialect_mysql.go b/dialect_mysql.go
index cf1dbb6f..7e28625c 100644
--- a/dialect_mysql.go
+++ b/dialect_mysql.go
@@ -243,8 +243,6 @@ func (db *mysql) SqlType(c *core.Column) string {
 	case core.Uuid:
 		res = core.Varchar
 		c.Length = 40
-	case core.Json:
-		res = core.Text
 	default:
 		res = t
 	}
diff --git a/dialect_oracle.go b/dialect_oracle.go
index 15010ca5..d4a6b0f4 100644
--- a/dialect_oracle.go
+++ b/dialect_oracle.go
@@ -519,7 +519,7 @@ func (db *oracle) SqlType(c *core.Column) string {
 		res = "TIMESTAMP WITH TIME ZONE"
 	case core.Float, core.Double, core.Numeric, core.Decimal:
 		res = "NUMBER"
-	case core.Text, core.MediumText, core.LongText, core.Json:
+	case core.Text, core.MediumText, core.LongText:
 		res = "CLOB"
 	case core.Char, core.Varchar, core.TinyText:
 		res = "VARCHAR2"
diff --git a/dialect_sqlite3.go b/dialect_sqlite3.go
index 0a290f3c..1b08b974 100644
--- a/dialect_sqlite3.go
+++ b/dialect_sqlite3.go
@@ -165,7 +165,7 @@ func (db *sqlite3) SqlType(c *core.Column) string {
 	case core.TimeStampz:
 		return core.Text
 	case core.Char, core.Varchar, core.NVarchar, core.TinyText,
-		core.Text, core.MediumText, core.LongText, core.Json:
+		core.Text, core.MediumText, core.LongText:
 		return core.Text
 	case core.Bit, core.TinyInt, core.SmallInt, core.MediumInt, core.Int, core.Integer, core.BigInt:
 		return core.Integer
diff --git a/engine.go b/engine.go
index a7e52ea4..41c00605 100644
--- a/engine.go
+++ b/engine.go
@@ -1076,7 +1076,6 @@ func (engine *Engine) mapType(v reflect.Value) (*core.Table, error) {
 		}
 
 		table.AddColumn(col)
-
 	} // end for
 
 	if idFieldColName != "" && len(table.PrimaryKeys) == 0 {
diff --git a/engine_cond.go b/engine_cond.go
index 702ac804..5db03d46 100644
--- a/engine_cond.go
+++ b/engine_cond.go
@@ -34,7 +34,7 @@ func (engine *Engine) buildConds(table *core.Table, bean interface{},
 		if engine.dialect.DBType() == core.MSSQL && (col.SQLType.Name == core.Text || col.SQLType.IsBlob() || col.SQLType.Name == core.TimeStampz) {
 			continue
 		}
-		if col.SQLType.IsJson() {
+		if col.IsJSON || col.SQLType.IsJson() {
 			continue
 		}
 
@@ -144,7 +144,7 @@ func (engine *Engine) buildConds(table *core.Table, bean interface{},
 					continue
 				}
 			} else {
-				if col.SQLType.IsJson() {
+				if col.IsJSON || col.SQLType.IsJson() {
 					if col.SQLType.IsText() {
 						bytes, err := DefaultJSONHandler.Marshal(fieldValue.Interface())
 						if err != nil {
diff --git a/session.go b/session.go
index 83071935..6a5c40fb 100644
--- a/session.go
+++ b/session.go
@@ -484,7 +484,7 @@ func (session *Session) slice2Bean(scanResults []interface{}, fields []string, b
 		fieldType := fieldValue.Type()
 		hasAssigned := false
 
-		if col.SQLType.IsJson() {
+		if col.IsJSON || col.SQLType.IsJson() {
 			var bs []byte
 			if rawValueType.Kind() == reflect.String {
 				bs = []byte(vv.String())
@@ -664,7 +664,7 @@ func (session *Session) slice2Bean(scanResults []interface{}, fields []string, b
 					session.engine.logger.Error("sql.Sanner error:", err.Error())
 					hasAssigned = false
 				}
-			} else if col.SQLType.IsJson() {
+			} else if col.IsJSON || col.SQLType.IsJson() {
 				if rawValueType.Kind() == reflect.String {
 					hasAssigned = true
 					x := reflect.New(fieldType)
diff --git a/session_convert.go b/session_convert.go
index 7f11354d..fdd5900a 100644
--- a/session_convert.go
+++ b/session_convert.go
@@ -595,7 +595,7 @@ func (session *Session) value2Interface(col *core.Column, fieldValue reflect.Val
 			return t.Float64, nil
 		}
 
-		if !col.SQLType.IsJson() {
+		if !(col.IsJSON || col.SQLType.IsJson()) {
 			// !<winxxp>! 增加支持driver.Valuer接口的结构，如sql.NullString
 			if v, ok := fieldValue.Interface().(driver.Valuer); ok {
 				return v.Value()
diff --git a/session_delete_test.go b/session_delete_test.go
index 5edb0718..4c02d770 100644
--- a/session_delete_test.go
+++ b/session_delete_test.go
@@ -8,8 +8,8 @@ import (
 	"testing"
 	"time"
 
-	"xorm.io/core"
 	"github.com/stretchr/testify/assert"
+	"xorm.io/core"
 )
 
 func TestDelete(t *testing.T) {
@@ -29,7 +29,7 @@ func TestDelete(t *testing.T) {
 	if testEngine.Dialect().DBType() == core.MSSQL {
 		err = session.Begin()
 		assert.NoError(t, err)
-		_, err = session.Exec("SET IDENTITY_INSERT userinfo_delete ON")
+		_, err = session.Exec("SET IDENTITY_INSERT " + testEngine.TableMapper.Obj2Table("UserinfoDelete") + " ON")
 		assert.NoError(t, err)
 	}
 
diff --git a/statement.go b/statement.go
index 67e35213..98d942e5 100644
--- a/statement.go
+++ b/statement.go
@@ -397,7 +397,7 @@ func (statement *Statement) buildUpdates(bean interface{},
 			} else if nulType, ok := fieldValue.Interface().(driver.Valuer); ok {
 				val, _ = nulType.Value()
 			} else {
-				if !col.SQLType.IsJson() {
+				if !(col.IsJSON || col.SQLType.IsJson()) {
 					engine.autoMapType(fieldValue)
 					if table, ok := engine.Tables[fieldValue.Type()]; ok {
 						if len(table.PrimaryKeys) == 1 {
diff --git a/tag.go b/tag.go
index ec8d5cf0..1cae62f0 100644
--- a/tag.go
+++ b/tag.go
@@ -55,12 +55,16 @@ var (
 		"CACHE":    CacheTagHandler,
 		"NOCACHE":  NoCacheTagHandler,
 		"COMMENT":  CommentTagHandler,
+		"JSON":     JSONTagHandler,
 	}
 )
 
 func init() {
 	for k := range core.SqlTypes {
-		defaultTagHandlers[k] = SQLTypeTagHandler
+		// don't overwrite
+		if _, ok := defaultTagHandlers[k]; !ok {
+			defaultTagHandlers[k] = SQLTypeTagHandler
+		}
 	}
 }
 
@@ -242,8 +246,19 @@ func SQLTypeTagHandler(ctx *tagContext) error {
 	return nil
 }
 
+// JSONTagHandler handle json tag
+func JSONTagHandler(ctx *tagContext) error {
+	fmt.Println("fdsfafadfs")
+	ctx.col.IsJSON = true
+	if len(ctx.params) == 0 {
+		ctx.col.SQLType = core.SQLType{Name: core.Text}
+	}
+	return nil
+}
+
 // ExtendsTagHandler describes extends tag handler
 func ExtendsTagHandler(ctx *tagContext) error {
+	ctx.ignoreNext = true
 	var fieldValue = ctx.fieldValue
 	var isPtr = false
 	switch fieldValue.Kind() {
diff --git a/tag_test.go b/tag_test.go
index 979ba929..64ad7b3e 100644
--- a/tag_test.go
+++ b/tag_test.go
@@ -598,3 +598,48 @@ func TestTagPrimarykey(t *testing.T) {
 	assert.True(t, col2.IsPrimaryKey)
 	assert.False(t, col2.IsAutoIncrement)
 }
+
+func TestTagJSON(t *testing.T) {
+	assert.NoError(t, prepareEngine())
+
+	type TestTagJSON1 struct {
+		Stings []string `xorm:"json"`
+	}
+
+	assert.NoError(t, testEngine.Sync2(new(TestTagJSON1)))
+
+	table := testEngine.TableInfo(new(TestTagJSON1))
+	assert.NotNil(t, table)
+	assert.EqualValues(t, 1, len(table.Columns()))
+	assert.True(t, table.Columns()[0].IsJSON)
+	assert.EqualValues(t, "TEXT", table.Columns()[0].SQLType.Name)
+
+	tables, err := testEngine.DBMetas()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, len(tables))
+	assert.EqualValues(t, 1, len(tables[0].Columns()))
+	if testEngine.dialect.DBType() != core.MSSQL {
+		assert.EqualValues(t, "TEXT", tables[0].Columns()[0].SQLType.Name)
+	}
+	assert.NoError(t, testEngine.DropTables(new(TestTagJSON1)))
+
+	type TestTagJSON2 struct {
+		Stings []string `xorm:"json MediumText"`
+	}
+
+	assert.NoError(t, testEngine.Sync2(new(TestTagJSON2)))
+
+	table = testEngine.TableInfo(new(TestTagJSON2))
+	assert.NotNil(t, table)
+	assert.EqualValues(t, 1, len(table.Columns()))
+	assert.True(t, table.Columns()[0].IsJSON)
+	assert.EqualValues(t, "MEDIUMTEXT", table.Columns()[0].SQLType.Name)
+
+	tables, err = testEngine.DBMetas()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, len(tables))
+	assert.EqualValues(t, 1, len(tables[0].Columns()))
+	if testEngine.dialect.DBType() == core.MYSQL {
+		assert.EqualValues(t, "MEDIUMTEXT", tables[0].Columns()[0].SQLType.Name)
+	}
+}
diff --git a/test_mssql.sh b/test_mssql.sh
index 7f060cff..a378089d 100755
--- a/test_mssql.sh
+++ b/test_mssql.sh
@@ -1 +1 @@
-go test -db=mssql -conn_str="server=localhost;user id=sa;password=yourStrong(!)Password;database=xorm_test"
\ No newline at end of file
+go test -db=mssql -conn_str="server=localhost;user id=sa;password=yourStrong(!)Password;database=xorm_test"