diff --git a/bench/http.go b/bench/http.go
index a60cf02..1d1bd4a 100644
--- a/bench/http.go
+++ b/bench/http.go
@@ -97,7 +97,7 @@ func qsAdjustBalance(uid int, amount int, c *gin.Context) (interface{}, error) {
 		return dtmcli.MapSuccess, nil
 	}
 	tb := dtmimp.TransBaseFromQuery(c.Request.URL.Query())
-	f := func(tx dtmcli.DB) error {
+	f := func(tx *sql.Tx) error {
 		for i := 0; i < sqls; i++ {
 			_, err := dtmimp.DBExec(tx, "insert into dtm_busi.user_account_log(user_id, delta, gid, branch_id, op, reason)  values(?,?,?,?,?,?)",
 				uid, amount, tb.Gid, c.Query("branch_id"), tb.TransType, fmt.Sprintf("inserted by dtm transaction %s %s", tb.Gid, c.Query("branch_id")))
diff --git a/dtmcli/barrier.go b/dtmcli/barrier.go
index fbd9215..480ae17 100644
--- a/dtmcli/barrier.go
+++ b/dtmcli/barrier.go
@@ -7,6 +7,7 @@
 package dtmcli
 
 import (
+	"database/sql"
 	"fmt"
 	"net/url"
 
@@ -14,7 +15,7 @@ import (
 )
 
 // BarrierBusiFunc type for busi func
-type BarrierBusiFunc func(db DB) error
+type BarrierBusiFunc func(tx *sql.Tx) error
 
 // BranchBarrier every branch info
 type BranchBarrier struct {
@@ -48,7 +49,7 @@ func BarrierFrom(transType, gid, branchID, op string) (*BranchBarrier, error) {
 	return ti, nil
 }
 
-func insertBarrier(tx Tx, transType string, gid string, branchID string, op string, barrierID string, reason string) (int64, error) {
+func insertBarrier(tx DB, transType string, gid string, branchID string, op string, barrierID string, reason string) (int64, error) {
 	if op == "" {
 		return 0, nil
 	}
@@ -59,7 +60,7 @@ func insertBarrier(tx Tx, transType string, gid string, branchID string, op stri
 // Call 子事务屏障，详细介绍见 https://zhuanlan.zhihu.com/p/388444465
 // tx: 本地数据库的事务对象，允许子事务屏障进行事务操作
 // busiCall: 业务函数，仅在必要时被调用
-func (bb *BranchBarrier) Call(tx Tx, busiCall BarrierBusiFunc) (rerr error) {
+func (bb *BranchBarrier) Call(tx *sql.Tx, busiCall BarrierBusiFunc) (rerr error) {
 	bb.BarrierID = bb.BarrierID + 1
 	bid := fmt.Sprintf("%02d", bb.BarrierID)
 	defer func() {
@@ -89,3 +90,12 @@ func (bb *BranchBarrier) Call(tx Tx, busiCall BarrierBusiFunc) (rerr error) {
 	rerr = busiCall(tx)
 	return
 }
+
+// CallWithDB the same as Call, but with *sql.DB
+func (bb *BranchBarrier) CallWithDB(db *sql.DB, busiCall BarrierBusiFunc) error {
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	return bb.Call(tx, busiCall)
+}
diff --git a/dtmcli/dtmimp/types.go b/dtmcli/dtmimp/types.go
index 632a072..3848fb0 100644
--- a/dtmcli/dtmimp/types.go
+++ b/dtmcli/dtmimp/types.go
@@ -13,10 +13,3 @@ type DB interface {
 	Exec(query string, args ...interface{}) (sql.Result, error)
 	QueryRow(query string, args ...interface{}) *sql.Row
 }
-
-// Tx interface of dtmcli tx
-type Tx interface {
-	Rollback() error
-	Commit() error
-	DB
-}
diff --git a/dtmcli/types.go b/dtmcli/types.go
index 4b502c8..64b4ab6 100644
--- a/dtmcli/types.go
+++ b/dtmcli/types.go
@@ -25,9 +25,6 @@ func MustGenGid(server string) string {
 // DB interface
 type DB = dtmimp.DB
 
-// Tx interface
-type Tx = dtmimp.Tx
-
 // TransOptions transaction option
 type TransOptions = dtmimp.TransOptions
 
diff --git a/examples/grpc_saga_barrier.go b/examples/grpc_saga_barrier.go
index c89a2d5..777b236 100644
--- a/examples/grpc_saga_barrier.go
+++ b/examples/grpc_saga_barrier.go
@@ -8,6 +8,7 @@ package examples
 
 import (
 	"context"
+	"database/sql"
 
 	"github.com/yedf/dtm/dtmcli"
 	"github.com/yedf/dtm/dtmcli/dtmimp"
@@ -41,28 +42,28 @@ func sagaGrpcBarrierAdjustBalance(db dtmcli.DB, uid int, amount int64, result st
 
 func (s *busiServer) TransInBSaga(ctx context.Context, in *BusiReq) (*emptypb.Empty, error) {
 	barrier := MustBarrierFromGrpc(ctx)
-	return &emptypb.Empty{}, barrier.Call(txGet(), func(tx dtmcli.DB) error {
+	return &emptypb.Empty{}, barrier.Call(txGet(), func(tx *sql.Tx) error {
 		return sagaGrpcBarrierAdjustBalance(tx, 2, in.Amount, in.TransInResult)
 	})
 }
 
 func (s *busiServer) TransOutBSaga(ctx context.Context, in *BusiReq) (*emptypb.Empty, error) {
 	barrier := MustBarrierFromGrpc(ctx)
-	return &emptypb.Empty{}, barrier.Call(txGet(), func(db dtmcli.DB) error {
-		return sagaGrpcBarrierAdjustBalance(db, 1, -in.Amount, in.TransOutResult)
+	return &emptypb.Empty{}, barrier.Call(txGet(), func(tx *sql.Tx) error {
+		return sagaGrpcBarrierAdjustBalance(tx, 1, -in.Amount, in.TransOutResult)
 	})
 }
 
 func (s *busiServer) TransInRevertBSaga(ctx context.Context, in *BusiReq) (*emptypb.Empty, error) {
 	barrier := MustBarrierFromGrpc(ctx)
-	return &emptypb.Empty{}, barrier.Call(txGet(), func(db dtmcli.DB) error {
-		return sagaGrpcBarrierAdjustBalance(db, 2, -in.Amount, "")
+	return &emptypb.Empty{}, barrier.Call(txGet(), func(tx *sql.Tx) error {
+		return sagaGrpcBarrierAdjustBalance(tx, 2, -in.Amount, "")
 	})
 }
 
 func (s *busiServer) TransOutRevertBSaga(ctx context.Context, in *BusiReq) (*emptypb.Empty, error) {
 	barrier := MustBarrierFromGrpc(ctx)
-	return &emptypb.Empty{}, barrier.Call(txGet(), func(db dtmcli.DB) error {
-		return sagaGrpcBarrierAdjustBalance(db, 1, in.Amount, "")
+	return &emptypb.Empty{}, barrier.Call(txGet(), func(tx *sql.Tx) error {
+		return sagaGrpcBarrierAdjustBalance(tx, 1, in.Amount, "")
 	})
 }
diff --git a/examples/http_saga_barrier.go b/examples/http_saga_barrier.go
index 7c9e916..c68aeb8 100644
--- a/examples/http_saga_barrier.go
+++ b/examples/http_saga_barrier.go
@@ -7,6 +7,8 @@
 package examples
 
 import (
+	"database/sql"
+
 	"github.com/gin-gonic/gin"
 	"github.com/yedf/dtm/common"
 	"github.com/yedf/dtm/dtmcli"
@@ -45,15 +47,15 @@ func sagaBarrierTransIn(c *gin.Context) (interface{}, error) {
 		return req.TransInResult, nil
 	}
 	barrier := MustBarrierFromGin(c)
-	return dtmcli.MapSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
-		return sagaBarrierAdjustBalance(db, 1, req.Amount)
+	return dtmcli.MapSuccess, barrier.Call(txGet(), func(tx *sql.Tx) error {
+		return sagaBarrierAdjustBalance(tx, 1, req.Amount)
 	})
 }
 
 func sagaBarrierTransInCompensate(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return dtmcli.MapSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
-		return sagaBarrierAdjustBalance(db, 1, -reqFrom(c).Amount)
+	return dtmcli.MapSuccess, barrier.Call(txGet(), func(tx *sql.Tx) error {
+		return sagaBarrierAdjustBalance(tx, 1, -reqFrom(c).Amount)
 	})
 }
 
@@ -63,14 +65,14 @@ func sagaBarrierTransOut(c *gin.Context) (interface{}, error) {
 		return req.TransOutResult, nil
 	}
 	barrier := MustBarrierFromGin(c)
-	return dtmcli.MapSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
-		return sagaBarrierAdjustBalance(db, 2, -req.Amount)
+	return dtmcli.MapSuccess, barrier.Call(txGet(), func(tx *sql.Tx) error {
+		return sagaBarrierAdjustBalance(tx, 2, -req.Amount)
 	})
 }
 
 func sagaBarrierTransOutCompensate(c *gin.Context) (interface{}, error) {
 	barrier := MustBarrierFromGin(c)
-	return dtmcli.MapSuccess, barrier.Call(txGet(), func(db dtmcli.DB) error {
-		return sagaBarrierAdjustBalance(db, 2, reqFrom(c).Amount)
+	return dtmcli.MapSuccess, barrier.Call(txGet(), func(tx *sql.Tx) error {
+		return sagaBarrierAdjustBalance(tx, 2, reqFrom(c).Amount)
 	})
 }
diff --git a/examples/http_saga_gorm_barrier.go b/examples/http_saga_gorm_barrier.go
index 8652a74..1f81c44 100644
--- a/examples/http_saga_gorm_barrier.go
+++ b/examples/http_saga_gorm_barrier.go
@@ -37,7 +37,7 @@ func sagaGormBarrierTransOut(c *gin.Context) (interface{}, error) {
 	req := reqFrom(c)
 	barrier := MustBarrierFromGin(c)
 	tx := dbGet().DB.Begin()
-	return dtmcli.MapSuccess, barrier.Call(tx.Statement.ConnPool.(*sql.Tx), func(db dtmcli.DB) error {
+	return dtmcli.MapSuccess, barrier.Call(tx.Statement.ConnPool.(*sql.Tx), func(tx1 *sql.Tx) error {
 		return tx.Exec("update dtm_busi.user_account set balance = balance + ? where user_id = ?", -req.Amount, 2).Error
 	})
 }
diff --git a/examples/http_tcc_barrier.go b/examples/http_tcc_barrier.go
index 089a4f6..85e65da 100644
--- a/examples/http_tcc_barrier.go
+++ b/examples/http_tcc_barrier.go
@@ -7,6 +7,7 @@
 package examples
 
 import (
+	"database/sql"
 	"fmt"
 
 	"github.com/gin-gonic/gin"
@@ -68,20 +69,20 @@ func tccBarrierTransInTry(c *gin.Context) (interface{}, error) {
 	if req.TransInResult != "" {
 		return req.TransInResult, nil
 	}
-	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(db dtmcli.DB) error {
-		return adjustTrading(db, transInUID, req.Amount)
+	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(tx *sql.Tx) error {
+		return adjustTrading(tx, transInUID, req.Amount)
 	})
 }
 
 func tccBarrierTransInConfirm(c *gin.Context) (interface{}, error) {
-	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(db dtmcli.DB) error {
-		return adjustBalance(db, transInUID, reqFrom(c).Amount)
+	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(tx *sql.Tx) error {
+		return adjustBalance(tx, transInUID, reqFrom(c).Amount)
 	})
 }
 
 func tccBarrierTransInCancel(c *gin.Context) (interface{}, error) {
-	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(db dtmcli.DB) error {
-		return adjustTrading(db, transInUID, -reqFrom(c).Amount)
+	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(tx *sql.Tx) error {
+		return adjustTrading(tx, transInUID, -reqFrom(c).Amount)
 	})
 }
 
@@ -90,20 +91,20 @@ func tccBarrierTransOutTry(c *gin.Context) (interface{}, error) {
 	if req.TransOutResult != "" {
 		return req.TransOutResult, nil
 	}
-	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(db dtmcli.DB) error {
-		return adjustTrading(db, transOutUID, -req.Amount)
+	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(tx *sql.Tx) error {
+		return adjustTrading(tx, transOutUID, -req.Amount)
 	})
 }
 
 func tccBarrierTransOutConfirm(c *gin.Context) (interface{}, error) {
-	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(db dtmcli.DB) error {
-		return adjustBalance(db, transOutUID, -reqFrom(c).Amount)
+	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(tx *sql.Tx) error {
+		return adjustBalance(tx, transOutUID, -reqFrom(c).Amount)
 	})
 }
 
 // TccBarrierTransOutCancel will be use in test
 func TccBarrierTransOutCancel(c *gin.Context) (interface{}, error) {
-	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(db dtmcli.DB) error {
-		return adjustTrading(db, transOutUID, reqFrom(c).Amount)
+	return dtmcli.MapSuccess, MustBarrierFromGin(c).Call(txGet(), func(tx *sql.Tx) error {
+		return adjustTrading(tx, transOutUID, reqFrom(c).Amount)
 	})
 }
diff --git a/test/base_test.go b/test/base_test.go
index a6dc3f4..c3922ef 100644
--- a/test/base_test.go
+++ b/test/base_test.go
@@ -7,6 +7,7 @@
 package test
 
 import (
+	"database/sql"
 	"fmt"
 	"testing"
 
@@ -38,7 +39,7 @@ func TestBaseSqlDB(t *testing.T) {
 	db.Must().Exec("insert into dtm_barrier.barrier(trans_type, gid, branch_id, op, reason) values('saga', 'gid1', 'branch_id1', 'action', 'saga')")
 	tx, err := db.ToSQLDB().Begin()
 	asserts.Nil(err)
-	err = barrier.Call(tx, func(db dtmcli.DB) error {
+	err = barrier.Call(tx, func(tx *sql.Tx) error {
 		dtmimp.Logf("rollback gid2")
 		return fmt.Errorf("gid2 error")
 	})
@@ -50,7 +51,7 @@ func TestBaseSqlDB(t *testing.T) {
 	barrier.BarrierID = 0
 	tx2, err := db.ToSQLDB().Begin()
 	asserts.Nil(err)
-	err = barrier.Call(tx2, func(db dtmcli.DB) error {
+	err = barrier.Call(tx2, func(tx *sql.Tx) error {
 		dtmimp.Logf("submit gid2")
 		return nil
 	})
diff --git a/test/tcc_barrier_test.go b/test/tcc_barrier_test.go
index 66184ec..3fb5339 100644
--- a/test/tcc_barrier_test.go
+++ b/test/tcc_barrier_test.go
@@ -126,7 +126,7 @@ func TestTccBarrierPanic(t *testing.T) {
 	func() {
 		defer dtmimp.P2E(&err)
 		tx, _ := dbGet().ToSQLDB().BeginTx(context.Background(), &sql.TxOptions{})
-		bb.Call(tx, func(db dtmcli.DB) error {
+		bb.Call(tx, func(tx *sql.Tx) error {
 			panic(fmt.Errorf("an error"))
 		})
 	}()