diff --git a/dtmsvr/config.go b/dtmsvr/config.go
index 85df1c8..3047f51 100644
--- a/dtmsvr/config.go
+++ b/dtmsvr/config.go
@@ -1,14 +1,14 @@
 package dtmsvr
 
 type dtmsvrConfig struct {
-	PreparedExpire  int64 // 单位秒，处于prepared中的任务，过了这个时间，查询结果还是PENDING的话，则会被cancel
-	JobCronInterval int64 // 单位秒 当事务等待这个时间之后，还没有变化，则进行一轮处理，包括prepared中的任务和commited的任务
-	Mysql           map[string]string
+	PreparedExpire    int64 // 单位秒，处于prepared中的任务，过了这个时间，查询结果还是PENDING的话，则会被cancel
+	TransCronInterval int64 // 单位秒 当事务等待这个时间之后，还没有变化，则进行一轮处理，包括prepared中的任务和commited的任务
+	Mysql             map[string]string
 }
 
 var config = &dtmsvrConfig{
-	PreparedExpire:  60,
-	JobCronInterval: 20,
+	PreparedExpire:    60,
+	TransCronInterval: 10,
 }
 
 var dbName = "dtm"
diff --git a/dtmsvr/cron.go b/dtmsvr/cron.go
index 119cf62..5214f46 100644
--- a/dtmsvr/cron.go
+++ b/dtmsvr/cron.go
@@ -11,56 +11,55 @@ import (
 
 func CronPrepared() {
 	for {
-		CronTransOnce(time.Duration(config.JobCronInterval)*time.Second, "prepared")
+		CronTransOnce(time.Duration(0), "prepared")
 		sleepCronTime()
 	}
 }
 
-func CronTransOnce(expire time.Duration, status string) bool {
+func CronTransOnce(expireIn time.Duration, status string) bool {
 	defer handlePanic()
-	trans := lockOneTrans(expire, status)
+	trans := lockOneTrans(expireIn, status)
 	if trans == nil {
 		return false
 	}
-	trans.touch(dbGet())
-	defer func() {
-		WaitTransProcessed(trans.Gid)
-	}()
+	defer WaitTransProcessed(trans.Gid)
 	trans.Process(dbGet())
 	return true
 }
 
 func CronCommitted() {
 	for {
-		notEmpty := CronTransOnce(time.Duration(config.JobCronInterval)*time.Second, "commitetd")
+		notEmpty := CronTransOnce(time.Duration(0), "commitetd")
 		if !notEmpty {
 			sleepCronTime()
 		}
 	}
 }
 
-func lockOneTrans(expire time.Duration, status string) *TransGlobal {
+func lockOneTrans(expireIn time.Duration, status string) *TransGlobal {
 	trans := TransGlobal{}
 	owner := common.GenGid()
 	db := dbGet()
 	dbr := db.Must().Model(&trans).
-		Where("update_time < date_sub(now(), interval ? second) and status=?", int(expire/time.Second), status).
+		Where("next_cron_time < date_add(now(), interval ? second) and status=?", int(expireIn/time.Second), status).
 		Limit(1).Update("owner", owner)
 	if dbr.RowsAffected == 0 {
 		return nil
 	}
 	dbr = db.Must().Where("owner=?", owner).Find(&trans)
+	updates := trans.setNextCron(trans.NextCronInterval * 2) // 下次被cron的间隔加倍
+	db.Must().Model(&trans).Select(updates).Updates(&trans)
 	return &trans
 }
 
 func handlePanic() {
 	if err := recover(); err != nil {
-		logrus.Printf("----panic %s handlered", err.(error).Error())
+		logrus.Errorf("----panic %s handlered", err.(error).Error())
 	}
 }
 
 func sleepCronTime() {
-	delta := math.Min(3, float64(config.JobCronInterval))
-	interval := time.Duration((float64(config.JobCronInterval) - rand.Float64()*delta) * float64(time.Second))
+	delta := math.Min(3, float64(config.TransCronInterval))
+	interval := time.Duration((float64(config.TransCronInterval) - rand.Float64()*delta) * float64(time.Second))
 	time.Sleep(interval)
 }
diff --git a/dtmsvr/dtmsvr.sql b/dtmsvr/dtmsvr.sql
index dd711e0..ff8d091 100644
--- a/dtmsvr/dtmsvr.sql
+++ b/dtmsvr/dtmsvr.sql
@@ -15,12 +15,15 @@ CREATE TABLE if not EXISTS `trans_global` (
   `commit_time` datetime DEFAULT NULL,
   `finish_time` datetime DEFAULT NULL,
   `rollback_time` datetime DEFAULT NULL,
+  `next_cron_interval` int(11) default null comment '下次定时处理的间隔',
+  `next_cron_time` datetime default null comment '下次定时处理的时间',
   `owner` varchar(128) not null default '' comment '正在处理全局事务的锁定者',
   PRIMARY KEY (`id`),
   UNIQUE KEY `gid` (`gid`),
   key `owner`(`owner`),
   KEY `create_time` (`create_time`),
-  KEY `update_time` (`update_time`)
+  KEY `update_time` (`update_time`),
+  key `next_cron_time` (`next_cron_time`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 drop table IF EXISTS trans_branch;
diff --git a/dtmsvr/dtmsvr_test.go b/dtmsvr/dtmsvr_test.go
index 9837eef..4f3f1b5 100644
--- a/dtmsvr/dtmsvr_test.go
+++ b/dtmsvr/dtmsvr_test.go
@@ -152,7 +152,7 @@ func tccRollbackPending(t *testing.T) {
 	WaitTransProcessed(tcc.Gid)
 	assert.Equal(t, "committed", getTransStatus(tcc.Gid))
 	examples.TccTransInCancelResult = ""
-	CronTransOnce(-10*time.Second, "committed")
+	CronTransOnce(60*time.Second, "committed")
 	assert.Equal(t, []string{"succeed", "prepared", "succeed", "succeed", "prepared", "failed"}, getBranchesStatus(tcc.Gid))
 }
 
@@ -170,14 +170,14 @@ func msgPending(t *testing.T) {
 	msg.Prepare("")
 	assert.Equal(t, "prepared", getTransStatus(msg.Gid))
 	examples.MsgTransQueryResult = "PENDING"
-	CronTransOnce(-10*time.Second, "prepared")
+	CronTransOnce(60*time.Second, "prepared")
 	assert.Equal(t, "prepared", getTransStatus(msg.Gid))
 	examples.MsgTransQueryResult = ""
 	examples.MsgTransInResult = "PENDING"
-	CronTransOnce(-10*time.Second, "prepared")
+	CronTransOnce(60*time.Second, "prepared")
 	assert.Equal(t, "committed", getTransStatus(msg.Gid))
 	examples.MsgTransInResult = ""
-	CronTransOnce(-10*time.Second, "committed")
+	CronTransOnce(60*time.Second, "committed")
 	assert.Equal(t, []string{"succeed", "succeed"}, getBranchesStatus(msg.Gid))
 	assert.Equal(t, "succeed", getTransStatus(msg.Gid))
 }
@@ -207,7 +207,7 @@ func sagaPrepareCancel(t *testing.T) {
 	saga.Prepare(saga.QueryPrepared)
 	examples.SagaTransQueryResult = "FAIL"
 	config.PreparedExpire = -10
-	CronTransOnce(-10*time.Second, "prepared")
+	CronTransOnce(60*time.Second, "prepared")
 	examples.SagaTransQueryResult = ""
 	config.PreparedExpire = 60
 	assert.Equal(t, "canceled", getTransStatus(saga.Gid))
@@ -217,10 +217,10 @@ func sagaPreparePending(t *testing.T) {
 	saga := genSaga("gid1-preparePending", false, false)
 	saga.Prepare(saga.QueryPrepared)
 	examples.SagaTransQueryResult = "PENDING"
-	CronTransOnce(-10*time.Second, "prepared")
+	CronTransOnce(60*time.Second, "prepared")
 	examples.SagaTransQueryResult = ""
 	assert.Equal(t, "prepared", getTransStatus(saga.Gid))
-	CronTransOnce(-10*time.Second, "prepared")
+	CronTransOnce(60*time.Second, "prepared")
 	assert.Equal(t, "succeed", getTransStatus(saga.Gid))
 }
 
@@ -232,7 +232,7 @@ func sagaCommittedPending(t *testing.T) {
 	WaitTransProcessed(saga.Gid)
 	examples.SagaTransInResult = ""
 	assert.Equal(t, []string{"prepared", "succeed", "prepared", "prepared"}, getBranchesStatus(saga.Gid))
-	CronTransOnce(-10*time.Second, "committed")
+	CronTransOnce(60*time.Second, "committed")
 	assert.Equal(t, []string{"prepared", "succeed", "prepared", "succeed"}, getBranchesStatus(saga.Gid))
 	assert.Equal(t, "succeed", getTransStatus(saga.Gid))
 }
diff --git a/dtmsvr/trans.go b/dtmsvr/trans.go
index 3563152..105a02b 100644
--- a/dtmsvr/trans.go
+++ b/dtmsvr/trans.go
@@ -14,14 +14,16 @@ import (
 
 type TransGlobal struct {
 	common.ModelBase
-	Gid           string `json:"gid"`
-	TransType     string `json:"trans_type"`
-	Data          string `json:"data"`
-	Status        string `json:"status"`
-	QueryPrepared string `json:"query_prepared"`
-	CommitTime    *time.Time
-	FinishTime    *time.Time
-	RollbackTime  *time.Time
+	Gid              string `json:"gid"`
+	TransType        string `json:"trans_type"`
+	Data             string `json:"data"`
+	Status           string `json:"status"`
+	QueryPrepared    string `json:"query_prepared"`
+	CommitTime       *time.Time
+	FinishTime       *time.Time
+	RollbackTime     *time.Time
+	NextCronInterval int64
+	NextCronTime     *time.Time
 }
 
 func (*TransGlobal) TableName() string {
@@ -34,24 +36,28 @@ type TransProcessor interface {
 	ExecBranch(db *common.DB, branch *TransBranch)
 }
 
-func (t *TransGlobal) touch(db *common.DB) *gorm.DB {
+func (t *TransGlobal) touch(db *common.DB, interval int64) *gorm.DB {
 	writeTransLog(t.Gid, "touch trans", "", "", "")
-	return db.Model(&TransGlobal{}).Where("gid=?", t.Gid).Update("gid", t.Gid) // 更新update_time，避免被定时任务再次
+	updates := t.setNextCron(interval)
+	return db.Model(&TransGlobal{}).Where("gid=?", t.Gid).Select(updates).Updates(t)
 }
 
 func (t *TransGlobal) changeStatus(db *common.DB, status string) *gorm.DB {
 	writeTransLog(t.Gid, "change status", status, "", "")
-	updates := M{
-		"status": status,
-	}
-	if status == "succeed" {
-		updates["finish_time"] = time.Now()
-	} else if status == "failed" {
-		updates["rollback_time"] = time.Now()
-	}
-	dbr := db.Must().Model(t).Where("status=?", t.Status).Updates(updates)
-	checkAffected(dbr)
+	old := t.Status
 	t.Status = status
+	updates := t.setNextCron(config.TransCronInterval)
+	updates = append(updates, "status")
+	now := time.Now()
+	if status == "succeed" {
+		t.FinishTime = &now
+		updates = append(updates, "finish_time")
+	} else if status == "failed" {
+		t.RollbackTime = &now
+		updates = append(updates, "rollback_time")
+	}
+	dbr := db.Must().Model(t).Where("status=?", old).Select(updates).Updates(t)
+	checkAffected(dbr)
 	return dbr
 }
 
@@ -114,7 +120,7 @@ func (t *TransGlobal) MayQueryPrepared(db *common.DB) {
 		if status != t.Status {
 			t.changeStatus(db, status)
 		} else {
-			t.touch(db)
+			t.touch(db, t.NextCronInterval*2)
 		}
 	} else if strings.Contains(body, "SUCCESS") {
 		t.changeStatus(db, "committed")
@@ -133,16 +139,23 @@ func (trans *TransGlobal) Process(db *common.DB) {
 	trans.getProcessor().ProcessOnce(db, branches)
 }
 
+func (t *TransGlobal) setNextCron(expireIn int64) []string {
+	t.NextCronInterval = expireIn
+	next := time.Now().Add(time.Duration(config.TransCronInterval) * time.Second)
+	t.NextCronTime = &next
+	return []string{"next_cron_interval", "next_cron_time"}
+}
+
 func (t *TransGlobal) SaveNew(db *common.DB) {
 	err := db.Transaction(func(db1 *gorm.DB) error {
 		db := &common.DB{DB: db1}
-
+		updates := t.setNextCron(config.TransCronInterval)
 		writeTransLog(t.Gid, "create trans", t.Status, "", t.Data)
 		dbr := db.Must().Clauses(clause.OnConflict{
 			DoNothing: true,
 		}).Create(t)
 		if dbr.RowsAffected == 0 && t.Status == "committed" { // 如果数据库已经存放了prepared的事务，则修改状态
-			dbr = db.Must().Model(&TransGlobal{}).Where("gid=? and status=?", t.Gid, "prepared").Update("status", t.Status)
+			dbr = db.Must().Model(t).Where("gid=? and status=?", t.Gid, "prepared").Select(append(updates, "status")).Updates(t)
 		}
 		if dbr.RowsAffected == 0 { // 未保存任何数据，直接返回
 			return nil
diff --git a/dtmsvr/trans_msg.go b/dtmsvr/trans_msg.go
index bd91201..be82917 100644
--- a/dtmsvr/trans_msg.go
+++ b/dtmsvr/trans_msg.go
@@ -36,9 +36,9 @@ func (t *TransMsgProcessor) ExecBranch(db *common.DB, branch *TransBranch) {
 	resp, err := common.RestyClient.R().SetBody(branch.Data).SetQueryParam("gid", branch.Gid).Post(branch.Url)
 	e2p(err)
 	body := resp.String()
-	t.touch(db)
 	if strings.Contains(body, "SUCCESS") {
 		branch.changeStatus(db, "succeed")
+		t.touch(db, config.TransCronInterval)
 	} else {
 		panic(fmt.Errorf("unknown response: %s, will be retried", body))
 	}
diff --git a/dtmsvr/trans_saga.go b/dtmsvr/trans_saga.go
index 90f621b..3ef83ed 100644
--- a/dtmsvr/trans_saga.go
+++ b/dtmsvr/trans_saga.go
@@ -38,10 +38,11 @@ func (t *TransSagaProcessor) ExecBranch(db *common.DB, branch *TransBranch) {
 	resp, err := common.RestyClient.R().SetBody(branch.Data).SetQueryParam("gid", branch.Gid).Post(branch.Url)
 	e2p(err)
 	body := resp.String()
-	t.touch(db)
 	if strings.Contains(body, "SUCCESS") {
+		t.touch(db, config.TransCronInterval)
 		branch.changeStatus(db, "succeed")
 	} else if branch.BranchType == "action" && strings.Contains(body, "FAIL") {
+		t.touch(db, config.TransCronInterval)
 		branch.changeStatus(db, "failed")
 	} else {
 		panic(fmt.Errorf("unknown response: %s, will be retried", body))
diff --git a/dtmsvr/trans_tcc.go b/dtmsvr/trans_tcc.go
index b6f5cb1..afd95a8 100644
--- a/dtmsvr/trans_tcc.go
+++ b/dtmsvr/trans_tcc.go
@@ -38,10 +38,11 @@ func (t *TransTccProcessor) ExecBranch(db *common.DB, branch *TransBranch) {
 	resp, err := common.RestyClient.R().SetBody(branch.Data).SetQueryParam("gid", branch.Gid).Post(branch.Url)
 	e2p(err)
 	body := resp.String()
-	t.touch(db)
 	if strings.Contains(body, "SUCCESS") {
+		t.touch(db, config.TransCronInterval)
 		branch.changeStatus(db, "succeed")
 	} else if branch.BranchType == "try" && strings.Contains(body, "FAIL") {
+		t.touch(db, config.TransCronInterval)
 		branch.changeStatus(db, "failed")
 	} else {
 		panic(fmt.Errorf("unknown response: %s, will be retried", body))
diff --git a/dtmsvr/trans_xa.go b/dtmsvr/trans_xa.go
index 3dd7c45..99c7a5f 100644
--- a/dtmsvr/trans_xa.go
+++ b/dtmsvr/trans_xa.go
@@ -26,8 +26,8 @@ func (t *TransXaProcessor) ExecBranch(db *common.DB, branch *TransBranch) {
 	}).Post(branch.Url)
 	e2p(err)
 	body := resp.String()
-	t.touch(db)
 	if strings.Contains(body, "SUCCESS") {
+		t.touch(db, config.TransCronInterval)
 		branch.changeStatus(db, "succeed")
 	} else {
 		panic(fmt.Errorf("bad response: %s", body))