diff --git a/dtmcli/xa.go b/dtmcli/xa.go
index 1625bc7..900627e 100644
--- a/dtmcli/xa.go
+++ b/dtmcli/xa.go
@@ -13,7 +13,7 @@ type M = map[string]interface{}
 
 var e2p = common.E2P
 
-type XaGlobalFunc func() error
+type XaGlobalFunc func(gid string) error
 
 type XaLocalFunc func(db *common.DB) error
 
@@ -75,7 +75,8 @@ func (xa *Xa) XaLocalTransaction(gid string, transFunc XaLocalFunc) (rerr error)
 	return nil
 }
 
-func (xa *Xa) XaGlobalTransaction(gid string, transFunc XaGlobalFunc) (rerr error) {
+func (xa *Xa) XaGlobalTransaction(transFunc XaGlobalFunc) (gid string, rerr error) {
+	gid = common.GenGid()
 	data := &M{
 		"gid":        gid,
 		"trans_type": "xa",
@@ -87,17 +88,17 @@ func (xa *Xa) XaGlobalTransaction(gid string, transFunc XaGlobalFunc) (rerr erro
 			rerr = x.(error)
 		}
 	}()
-	resp, err := common.RestyClient.R().SetBody(data).Post(xa.Server + "/prepare")
-	e2p(err)
+	resp, rerr := common.RestyClient.R().SetBody(data).Post(xa.Server + "/prepare")
+	e2p(rerr)
 	if !strings.Contains(resp.String(), "SUCCESS") {
 		panic(fmt.Errorf("unexpected result: %s", resp.String()))
 	}
-	err = transFunc()
-	e2p(err)
-	resp, err = common.RestyClient.R().SetBody(data).Post(xa.Server + "/submit")
-	e2p(err)
+	rerr = transFunc(gid)
+	e2p(rerr)
+	resp, rerr = common.RestyClient.R().SetBody(data).Post(xa.Server + "/submit")
+	e2p(rerr)
 	if !strings.Contains(resp.String(), "SUCCESS") {
 		panic(fmt.Errorf("unexpected result: %s", resp.String()))
 	}
-	return nil
+	return
 }
diff --git a/dtmsvr/dtmsvr_test.go b/dtmsvr/dtmsvr_test.go
index 98f1e84..1d82572 100644
--- a/dtmsvr/dtmsvr_test.go
+++ b/dtmsvr/dtmsvr_test.go
@@ -87,8 +87,7 @@ func getBranchesStatus(gid string) []string {
 
 func xaNormal(t *testing.T) {
 	xa := examples.XaClient
-	gid := "xa-normal"
-	err := xa.XaGlobalTransaction(gid, func() error {
+	gid, err := xa.XaGlobalTransaction(func(gid string) error {
 		req := examples.GenTransReq(30, false, false)
 		resp, err := common.RestyClient.R().SetBody(req).SetQueryParams(map[string]string{
 			"gid":     gid,
@@ -109,8 +108,7 @@ func xaNormal(t *testing.T) {
 
 func xaRollback(t *testing.T) {
 	xa := examples.XaClient
-	gid := "xa-rollback"
-	err := xa.XaGlobalTransaction(gid, func() error {
+	gid, err := xa.XaGlobalTransaction(func(gid string) error {
 		req := examples.GenTransReq(30, false, true)
 		resp, err := common.RestyClient.R().SetBody(req).SetQueryParams(map[string]string{
 			"gid":     gid,
diff --git a/examples/main_xa.go b/examples/main_xa.go
index ffa3184..fc3e9e8 100644
--- a/examples/main_xa.go
+++ b/examples/main_xa.go
@@ -34,8 +34,7 @@ func XaMain() {
 }
 
 func XaFireRequest() {
-	gid := common.GenGid()
-	err := XaClient.XaGlobalTransaction(gid, func() (rerr error) {
+	_, err := XaClient.XaGlobalTransaction(func(gid string) (rerr error) {
 		defer common.P2E(&rerr)
 		req := GenTransReq(30, false, false)
 		resp, err := common.RestyClient.R().SetBody(req).SetQueryParams(map[string]string{