diff --git a/.gitignore b/.gitignore
index 220eede..e6d0a57 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 conf.yml*
 *.out
 */**/main
-main
\ No newline at end of file
+main
+intra-barrier.md
diff --git a/dtmsvr/dtmsvr_test.go b/dtmsvr/dtmsvr_test.go
index 4f3f1b5..38686fe 100644
--- a/dtmsvr/dtmsvr_test.go
+++ b/dtmsvr/dtmsvr_test.go
@@ -50,8 +50,6 @@ func TestDtmSvr(t *testing.T) {
 	xaNormal(t)
 	xaRollback(t)
 	sagaCommittedPending(t)
-	sagaPreparePending(t)
-	sagaPrepareCancel(t)
 	sagaRollback(t)
 
 }
@@ -132,8 +130,6 @@ func xaRollback(t *testing.T) {
 
 func tccNormal(t *testing.T) {
 	tcc := genTcc("gid-tcc-normal", false, false)
-	tcc.Prepare(tcc.QueryPrepared)
-	assert.Equal(t, "prepared", getTransStatus(tcc.Gid))
 	tcc.Commit()
 	assert.Equal(t, "committed", getTransStatus(tcc.Gid))
 	WaitTransProcessed(tcc.Gid)
@@ -184,8 +180,6 @@ func msgPending(t *testing.T) {
 
 func sagaNormal(t *testing.T) {
 	saga := genSaga("gid-noramlSaga", false, false)
-	saga.Prepare(saga.QueryPrepared)
-	assert.Equal(t, "prepared", getTransStatus(saga.Gid))
 	saga.Commit()
 	assert.Equal(t, "committed", getTransStatus(saga.Gid))
 	WaitTransProcessed(saga.Gid)
@@ -197,36 +191,12 @@ func sagaRollback(t *testing.T) {
 	saga := genSaga("gid-rollbackSaga2", false, true)
 	saga.Commit()
 	WaitTransProcessed(saga.Gid)
-	saga.Prepare(saga.QueryPrepared)
 	assert.Equal(t, "failed", getTransStatus(saga.Gid))
 	assert.Equal(t, []string{"succeed", "succeed", "succeed", "failed"}, getBranchesStatus(saga.Gid))
 }
 
-func sagaPrepareCancel(t *testing.T) {
-	saga := genSaga("gid1-prepareCancel", false, true)
-	saga.Prepare(saga.QueryPrepared)
-	examples.SagaTransQueryResult = "FAIL"
-	config.PreparedExpire = -10
-	CronTransOnce(60*time.Second, "prepared")
-	examples.SagaTransQueryResult = ""
-	config.PreparedExpire = 60
-	assert.Equal(t, "canceled", getTransStatus(saga.Gid))
-}
-
-func sagaPreparePending(t *testing.T) {
-	saga := genSaga("gid1-preparePending", false, false)
-	saga.Prepare(saga.QueryPrepared)
-	examples.SagaTransQueryResult = "PENDING"
-	CronTransOnce(60*time.Second, "prepared")
-	examples.SagaTransQueryResult = ""
-	assert.Equal(t, "prepared", getTransStatus(saga.Gid))
-	CronTransOnce(60*time.Second, "prepared")
-	assert.Equal(t, "succeed", getTransStatus(saga.Gid))
-}
-
 func sagaCommittedPending(t *testing.T) {
 	saga := genSaga("gid-committedPending", false, false)
-	saga.Prepare(saga.QueryPrepared)
 	examples.SagaTransInResult = "PENDING"
 	saga.Commit()
 	WaitTransProcessed(saga.Gid)
@@ -250,7 +220,6 @@ func genMsg(gid string) *dtm.Msg {
 func genSaga(gid string, outFailed bool, inFailed bool) *dtm.Saga {
 	logrus.Printf("beginning a saga test ---------------- %s", gid)
 	saga := dtm.SagaNew(examples.DtmServer, gid)
-	saga.QueryPrepared = examples.SagaBusi + "/TransQuery"
 	req := examples.GenTransReq(30, outFailed, inFailed)
 	saga.Add(examples.SagaBusi+"/TransOut", examples.SagaBusi+"/TransOutCompensate", &req)
 	saga.Add(examples.SagaBusi+"/TransIn", examples.SagaBusi+"/TransInCompensate", &req)
@@ -260,7 +229,6 @@ func genSaga(gid string, outFailed bool, inFailed bool) *dtm.Saga {
 func genTcc(gid string, outFailed bool, inFailed bool) *dtm.Tcc {
 	logrus.Printf("beginning a tcc test ---------------- %s", gid)
 	tcc := dtm.TccNew(examples.DtmServer, gid)
-	tcc.QueryPrepared = examples.TccBusi + "/TransQuery"
 	req := examples.GenTransReq(30, outFailed, inFailed)
 	tcc.Add(examples.TccBusi+"/TransOutTry", examples.TccBusi+"/TransOutConfirm", examples.TccBusi+"/TransOutCancel", &req)
 	tcc.Add(examples.TccBusi+"/TransInTry", examples.TccBusi+"/TransInConfirm", examples.TccBusi+"/TransInCancel", &req)
diff --git a/dtmsvr/trans.go b/dtmsvr/trans.go
index 8da935b..47e630e 100644
--- a/dtmsvr/trans.go
+++ b/dtmsvr/trans.go
@@ -2,7 +2,6 @@ package dtmsvr
 
 import (
 	"fmt"
-	"strings"
 	"time"
 
 	"github.com/gin-gonic/gin"
@@ -106,27 +105,6 @@ func (trans *TransGlobal) getProcessor() TransProcessor {
 	return processorFac[trans.TransType](trans)
 }
 
-func (t *TransGlobal) MayQueryPrepared(db *common.DB) {
-	if t.Status != "prepared" {
-		return
-	}
-	resp, err := common.RestyClient.R().SetQueryParam("gid", t.Gid).Get(t.QueryPrepared)
-	e2p(err)
-	body := resp.String()
-	if strings.Contains(body, "FAIL") {
-		preparedExpire := time.Now().Add(time.Duration(-config.PreparedExpire) * time.Second)
-		logrus.Printf("create time: %s prepared expire: %s ", t.CreateTime.Local(), preparedExpire.Local())
-		status := common.If(t.CreateTime.Before(preparedExpire), "canceled", "prepared").(string)
-		if status != t.Status {
-			t.changeStatus(db, status)
-		} else {
-			t.touch(db, t.NextCronInterval*2)
-		}
-	} else if strings.Contains(body, "SUCCESS") {
-		t.changeStatus(db, "committed")
-	}
-}
-
 func (trans *TransGlobal) Process(db *common.DB) {
 	defer handlePanic()
 	defer func() {
diff --git a/dtmsvr/trans_msg.go b/dtmsvr/trans_msg.go
index 88454f2..e3c31e7 100644
--- a/dtmsvr/trans_msg.go
+++ b/dtmsvr/trans_msg.go
@@ -3,7 +3,9 @@ package dtmsvr
 import (
 	"fmt"
 	"strings"
+	"time"
 
+	"github.com/sirupsen/logrus"
 	"github.com/yedf/dtm/common"
 )
 
@@ -44,8 +46,29 @@ func (t *TransMsgProcessor) ExecBranch(db *common.DB, branch *TransBranch) {
 	}
 }
 
+func (t *TransGlobal) mayQueryPrepared(db *common.DB) {
+	if t.Status != "prepared" {
+		return
+	}
+	resp, err := common.RestyClient.R().SetQueryParam("gid", t.Gid).Get(t.QueryPrepared)
+	e2p(err)
+	body := resp.String()
+	if strings.Contains(body, "FAIL") {
+		preparedExpire := time.Now().Add(time.Duration(-config.PreparedExpire) * time.Second)
+		logrus.Printf("create time: %s prepared expire: %s ", t.CreateTime.Local(), preparedExpire.Local())
+		status := common.If(t.CreateTime.Before(preparedExpire), "canceled", "prepared").(string)
+		if status != t.Status {
+			t.changeStatus(db, status)
+		} else {
+			t.touch(db, t.NextCronInterval*2)
+		}
+	} else if strings.Contains(body, "SUCCESS") {
+		t.changeStatus(db, "committed")
+	}
+}
+
 func (t *TransMsgProcessor) ProcessOnce(db *common.DB, branches []TransBranch) {
-	t.MayQueryPrepared(db)
+	t.mayQueryPrepared(db)
 	if t.Status != "committed" {
 		return
 	}
diff --git a/dtmsvr/trans_saga.go b/dtmsvr/trans_saga.go
index f4e6bf3..66052e3 100644
--- a/dtmsvr/trans_saga.go
+++ b/dtmsvr/trans_saga.go
@@ -51,7 +51,6 @@ func (t *TransSagaProcessor) ExecBranch(db *common.DB, branch *TransBranch) {
 }
 
 func (t *TransSagaProcessor) ProcessOnce(db *common.DB, branches []TransBranch) {
-	t.MayQueryPrepared(db)
 	if t.Status != "committed" {
 		return
 	}
diff --git a/dtmsvr/trans_tcc.go b/dtmsvr/trans_tcc.go
index 21734fd..7c3a7f3 100644
--- a/dtmsvr/trans_tcc.go
+++ b/dtmsvr/trans_tcc.go
@@ -51,7 +51,6 @@ func (t *TransTccProcessor) ExecBranch(db *common.DB, branch *TransBranch) {
 }
 
 func (t *TransTccProcessor) ProcessOnce(db *common.DB, branches []TransBranch) {
-	t.MayQueryPrepared(db)
 	if t.Status != "committed" {
 		return
 	}
diff --git a/examples/examples.sql b/examples/examples.sql
index 1db3e05..286a444 100644
--- a/examples/examples.sql
+++ b/examples/examples.sql
@@ -17,11 +17,11 @@ drop table if exists user_account_trading;
 create table if not exists user_account_trading( -- 表示交易中被冻结的金额
   id int(11) PRIMARY KEY AUTO_INCREMENT,
   user_id int(11) UNIQUE ,
-  frozen DECIMAL(10, 2) not null default '0',
+  trading_balance DECIMAL(10, 2) not null default '0',
   create_time datetime DEFAULT now(),
   update_time datetime DEFAULT now(),
   key(create_time),
   key(update_time)
 );
 
-insert into user_account_trading (user_id, balance) values (1, 0), (2, 0) on DUPLICATE KEY UPDATE balance=values (balance);
\ No newline at end of file
+insert into user_account_trading (user_id, trading_balance) values (1, 0), (2, 0) on DUPLICATE KEY UPDATE trading_balance=values (trading_balance);
\ No newline at end of file
diff --git a/examples/main_msg.go b/examples/main_msg.go
index 05d38d9..9b12819 100644
--- a/examples/main_msg.go
+++ b/examples/main_msg.go
@@ -11,7 +11,6 @@ import (
 )
 
 // 事务参与者的服务地址
-const MsgBusiPort = 8085
 const MsgBusiApi = "/api/busi_msg"
 
 var MsgBusi = fmt.Sprintf("http://localhost:%d%s", MsgBusiPort, MsgBusiApi)
diff --git a/examples/main_saga.go b/examples/main_saga.go
index d39283f..4db843c 100644
--- a/examples/main_saga.go
+++ b/examples/main_saga.go
@@ -11,7 +11,6 @@ import (
 )
 
 // 事务参与者的服务地址
-const SagaBusiPort = 8081
 const SagaBusiApi = "/api/busi_saga"
 
 var SagaBusi = fmt.Sprintf("http://localhost:%d%s", SagaBusiPort, SagaBusiApi)
@@ -40,10 +39,8 @@ func SagaFireRequest() {
 	saga := dtm.SagaNew(DtmServer, gid).
 		Add(SagaBusi+"/TransOut", SagaBusi+"/TransOutCompensate", req).
 		Add(SagaBusi+"/TransIn", SagaBusi+"/TransInCompensate", req)
-	err := saga.Prepare(SagaBusi + "/TransQuery")
-	e2p(err)
 	logrus.Printf("busi trans commit")
-	err = saga.Commit()
+	err := saga.Commit()
 	e2p(err)
 }
 
@@ -54,7 +51,6 @@ func SagaAddRoute(app *gin.Engine) {
 	app.POST(SagaBusiApi+"/TransInCompensate", common.WrapHandler(sagaTransInCompensate))
 	app.POST(SagaBusiApi+"/TransOut", common.WrapHandler(SagaTransOut))
 	app.POST(SagaBusiApi+"/TransOutCompensate", common.WrapHandler(sagaTransOutCompensate))
-	app.GET(SagaBusiApi+"/TransQuery", common.WrapHandler(sagaTransQuery))
 	logrus.Printf("examples listening at %d", SagaBusiPort)
 }
 
@@ -62,7 +58,6 @@ var SagaTransInResult = ""
 var SagaTransOutResult = ""
 var SagaTransInCompensateResult = ""
 var SagaTransOutCompensateResult = ""
-var SagaTransQueryResult = ""
 
 func sagaTransIn(c *gin.Context) (interface{}, error) {
 	gid := c.Query("gid")
@@ -95,10 +90,3 @@ func sagaTransOutCompensate(c *gin.Context) (interface{}, error) {
 	logrus.Printf("%s TransOutCompensate: %v result: %s", gid, req, res)
 	return M{"result": res}, nil
 }
-
-func sagaTransQuery(c *gin.Context) (interface{}, error) {
-	gid := c.Query("gid")
-	logrus.Printf("%s TransQuery", gid)
-	res := common.OrString(SagaTransQueryResult, "SUCCESS")
-	return M{"result": res}, nil
-}
diff --git a/examples/main_tcc.go b/examples/main_tcc.go
index 774b9de..736f8bf 100644
--- a/examples/main_tcc.go
+++ b/examples/main_tcc.go
@@ -11,7 +11,6 @@ import (
 )
 
 // 事务参与者的服务地址
-const TccBusiPort = 8083
 const TccBusiApi = "/api/busi_tcc"
 
 var TccBusi = fmt.Sprintf("http://localhost:%d%s", TccBusiPort, TccBusiApi)
@@ -40,10 +39,8 @@ func TccFireRequest() {
 	tcc := dtm.TccNew(DtmServer, gid).
 		Add(TccBusi+"/TransOutTry", TccBusi+"/TransOutConfirm", TccBusi+"/TransOutCancel", req).
 		Add(TccBusi+"/TransInTry", TccBusi+"/TransInConfirm", TccBusi+"/TransOutCancel", req)
-	err := tcc.Prepare(TccBusi + "/TransQuery")
-	e2p(err)
 	logrus.Printf("busi trans commit")
-	err = tcc.Commit()
+	err := tcc.Commit()
 	e2p(err)
 }
 
@@ -56,7 +53,6 @@ func TccAddRoute(app *gin.Engine) {
 	app.POST(TccBusiApi+"/TransOutTry", common.WrapHandler(tccTransOutTry))
 	app.POST(TccBusiApi+"/TransOutConfirm", common.WrapHandler(tccTransOutConfirm))
 	app.POST(TccBusiApi+"/TransOutCancel", common.WrapHandler(tccTransOutCancel))
-	app.GET(TccBusiApi+"/TransQuery", common.WrapHandler(tccTransQuery))
 	logrus.Printf("examples listening at %d", TccBusiPort)
 }
 
@@ -66,7 +62,6 @@ var TccTransInCancelResult = ""
 var TccTransOutCancelResult = ""
 var TccTransInConfirmResult = ""
 var TccTransOutConfirmResult = ""
-var TccTransQueryResult = ""
 
 func tccTransInTry(c *gin.Context) (interface{}, error) {
 	gid := c.Query("gid")
@@ -115,10 +110,3 @@ func tccTransOutCancel(c *gin.Context) (interface{}, error) {
 	logrus.Printf("%s tccTransOutCancel: %v result: %s", gid, req, res)
 	return M{"result": res}, nil
 }
-
-func tccTransQuery(c *gin.Context) (interface{}, error) {
-	gid := c.Query("gid")
-	logrus.Printf("%s TransQuery", gid)
-	res := common.OrString(TccTransQueryResult, "SUCCESS")
-	return M{"result": res}, nil
-}
diff --git a/examples/main_xa.go b/examples/main_xa.go
index 3903431..29c7eee 100644
--- a/examples/main_xa.go
+++ b/examples/main_xa.go
@@ -12,7 +12,6 @@ import (
 )
 
 // 事务参与者的服务地址
-const XaBusiPort = 8082
 const XaBusiApi = "/api/busi_xa"
 
 var XaBusi = fmt.Sprintf("http://localhost:%d%s", XaBusiPort, XaBusiApi)
diff --git a/examples/quick_start.go b/examples/quick_start.go
index 251d4f4..eb0ced3 100644
--- a/examples/quick_start.go
+++ b/examples/quick_start.go
@@ -11,7 +11,6 @@ import (
 )
 
 // 事务参与者的服务地址
-const startBusiPort = 8084
 const startBusiApi = "/api/busi_start"
 
 var startBusi = fmt.Sprintf("http://localhost:%d%s", startBusiPort, startBusiApi)
diff --git a/examples/types.go b/examples/types.go
index 82e9efa..f282f2a 100644
--- a/examples/types.go
+++ b/examples/types.go
@@ -12,6 +12,16 @@ type M = map[string]interface{}
 // 指定dtm服务地址
 const DtmServer = "http://localhost:8080/api/dtmsvr"
 
+const (
+	MsgBusiPort = iota + 8081
+	SagaBusiPort
+	SagaBarrierBusiPort
+	TccBusiPort
+	TccBarrierBusiPort
+	XaBusiPort
+	startBusiPort
+)
+
 type TransReq struct {
 	Amount         int    `json:"amount"`
 	TransInResult  string `json:"transInResult"`
diff --git a/saga.go b/saga.go
index 2a3d80e..3fd687a 100644
--- a/saga.go
+++ b/saga.go
@@ -13,10 +13,9 @@ type Saga struct {
 }
 
 type SagaData struct {
-	Gid           string     `json:"gid"`
-	TransType     string     `json:"trans_type"`
-	Steps         []SagaStep `json:"steps"`
-	QueryPrepared string     `json:"query_prepared"`
+	Gid       string     `json:"gid"`
+	TransType string     `json:"trans_type"`
+	Steps     []SagaStep `json:"steps"`
 }
 type SagaStep struct {
 	Action     string `json:"action"`
@@ -55,16 +54,3 @@ func (s *Saga) Commit() error {
 	}
 	return nil
 }
-
-func (s *Saga) Prepare(queryPrepared string) error {
-	s.QueryPrepared = common.OrString(queryPrepared, s.QueryPrepared)
-	logrus.Printf("preparing %s body: %v", s.Gid, &s.SagaData)
-	resp, err := common.RestyClient.R().SetBody(&s.SagaData).Post(fmt.Sprintf("%s/prepare", s.Server))
-	if err != nil {
-		return err
-	}
-	if resp.StatusCode() != 200 {
-		return fmt.Errorf("prepare failed: %v", resp.Body())
-	}
-	return nil
-}
diff --git a/tcc.go b/tcc.go
index 77f4b93..df857a0 100644
--- a/tcc.go
+++ b/tcc.go
@@ -13,10 +13,9 @@ type Tcc struct {
 }
 
 type TccData struct {
-	Gid           string    `json:"gid"`
-	TransType     string    `json:"trans_type"`
-	Steps         []TccStep `json:"steps"`
-	QueryPrepared string    `json:"query_prepared"`
+	Gid       string    `json:"gid"`
+	TransType string    `json:"trans_type"`
+	Steps     []TccStep `json:"steps"`
 }
 type TccStep struct {
 	Try     string `json:"try"`
@@ -57,16 +56,3 @@ func (s *Tcc) Commit() error {
 	}
 	return nil
 }
-
-func (s *Tcc) Prepare(queryPrepared string) error {
-	s.QueryPrepared = common.OrString(queryPrepared, s.QueryPrepared)
-	logrus.Printf("preparing %s body: %v", s.Gid, &s.TccData)
-	resp, err := common.RestyClient.R().SetBody(&s.TccData).Post(fmt.Sprintf("%s/prepare", s.Server))
-	if err != nil {
-		return err
-	}
-	if resp.StatusCode() != 200 {
-		return fmt.Errorf("prepare failed: %v", resp.Body())
-	}
-	return nil
-}
diff --git a/xa.go b/xa.go
index 5e051b2..8d67b97 100644
--- a/xa.go
+++ b/xa.go
@@ -42,9 +42,7 @@ func XaClientNew(server string, mysqlConf map[string]string, app *gin.Engine, ca
 		e2p(err)
 		common.MustUnmarshal(b, &req)
 		tx, my := common.DbAlone(xa.Conf)
-		defer func() {
-			my.Close()
-		}()
+		defer my.Close()
 		if req.Action == "commit" {
 			tx.Must().Exec(fmt.Sprintf("xa commit '%s'", req.Branch))
 		} else if req.Action == "rollback" {