diff --git a/dtmcli/barrier.go b/dtmcli/barrier.go
index 492296d..7bdf1ad 100644
--- a/dtmcli/barrier.go
+++ b/dtmcli/barrier.go
@@ -63,9 +63,9 @@ func insertBarrier(tx DB, transType string, gid string, branchID string, op stri
 	return dtmimp.DBExec(tx, sql, transType, gid, branchID, op, barrierID, reason)
 }
 
-// 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
+// Call see detail description in https://en.dtm.pub/practice/barrier.html
+// tx: local transaction connection
+// busiCall: busi func
 func (bb *BranchBarrier) Call(tx *sql.Tx, busiCall BarrierBusiFunc) (rerr error) {
 	bid := bb.newBarrierID()
 	defer dtmimp.DeferDo(&rerr, func() error {
diff --git a/dtmcli/dtmimp/README-cn.md b/dtmcli/dtmimp/README-cn.md
new file mode 100644
index 0000000..ba4fb25
--- /dev/null
+++ b/dtmcli/dtmimp/README-cn.md
@@ -0,0 +1,2 @@
+## 注意
+此包带imp后缀，主要被dtm内部使用，相关接口可能会发生变更，请勿使用这里的接口
\ No newline at end of file
diff --git a/dtmcli/dtmimp/README.md b/dtmcli/dtmimp/README.md
index ba4fb25..06aa51e 100644
--- a/dtmcli/dtmimp/README.md
+++ b/dtmcli/dtmimp/README.md
@@ -1,2 +1,2 @@
-## 注意
-此包带imp后缀，主要被dtm内部使用，相关接口可能会发生变更，请勿使用这里的接口
\ No newline at end of file
+## Notice
+Please donot use this package, and this package should only be used in dtm internally. The interfaces are not stable, and package name has postfix "imp"
\ No newline at end of file
diff --git a/dtmcli/dtmimp/trans_xa_base.go b/dtmcli/dtmimp/trans_xa_base.go
index d1eb352..a61a3ac 100644
--- a/dtmcli/dtmimp/trans_xa_base.go
+++ b/dtmcli/dtmimp/trans_xa_base.go
@@ -61,13 +61,12 @@ func (xc *XaClientBase) HandleLocalTrans(xa *TransBase, cb func(*sql.DB) error)
 	return
 }
 
-// HandleGlobalTrans http/grpc GlobalTransaction的公共方法
+// HandleGlobalTrans http/grpc GlobalTransaction shared func
 func (xc *XaClientBase) HandleGlobalTrans(xa *TransBase, callDtm func(string) error, callBusi func() error) (rerr error) {
 	rerr = callDtm("prepare")
 	if rerr != nil {
 		return
 	}
-	// 小概率情况下，prepare成功了，但是由于网络状况导致上面Failure，那么不执行下面defer的内容，等待超时后再回滚标记事务失败，也没有问题
 	defer DeferDo(&rerr, func() error {
 		return callDtm("submit")
 	}, func() error {
diff --git a/dtmcli/tcc.go b/dtmcli/tcc.go
index 7d0c77d..b68c5ae 100644
--- a/dtmcli/tcc.go
+++ b/dtmcli/tcc.go
@@ -25,7 +25,7 @@ type TccGlobalFunc func(tcc *Tcc) (*resty.Response, error)
 // TccGlobalTransaction begin a tcc global transaction
 // dtm dtm server address
 // gid global transaction ID
-// tccFunc tcc事务函数，里面会定义全局事务的分支
+// tccFunc define the detail tcc busi
 func TccGlobalTransaction(dtm string, gid string, tccFunc TccGlobalFunc) (rerr error) {
 	return TccGlobalTransaction2(dtm, gid, func(t *Tcc) {}, tccFunc)
 }
@@ -38,7 +38,6 @@ func TccGlobalTransaction2(dtm string, gid string, custom func(*Tcc), tccFunc Tc
 	if rerr != nil {
 		return rerr
 	}
-	// 小概率情况下，prepare成功了，但是由于网络状况导致上面Failure，那么不执行下面defer的内容，等待超时后再回滚标记事务失败，也没有问题
 	defer dtmimp.DeferDo(&rerr, func() error {
 		return dtmimp.TransCallDtm(&tcc.TransBase, tcc, "submit")
 	}, func() error {
diff --git a/dtmcli/xa.go b/dtmcli/xa.go
index 505837d..179891d 100644
--- a/dtmcli/xa.go
+++ b/dtmcli/xa.go
@@ -58,7 +58,7 @@ func NewXaClient(server string, mysqlConf DBConf, notifyURL string, register XaR
 	return xa, nil
 }
 
-// HandleCallback 处理commit/rollback的回调
+// HandleCallback handle commit/rollback callback
 func (xc *XaClient) HandleCallback(gid string, branchID string, action string) interface{} {
 	return xc.XaClientBase.HandleCallback(gid, branchID, action)
 }
diff --git a/dtmgrpc/dtmgimp/README-cn.md b/dtmgrpc/dtmgimp/README-cn.md
new file mode 100644
index 0000000..ba4fb25
--- /dev/null
+++ b/dtmgrpc/dtmgimp/README-cn.md
@@ -0,0 +1,2 @@
+## 注意
+此包带imp后缀，主要被dtm内部使用，相关接口可能会发生变更，请勿使用这里的接口
\ No newline at end of file
diff --git a/dtmgrpc/dtmgimp/README.md b/dtmgrpc/dtmgimp/README.md
index ba4fb25..06aa51e 100644
--- a/dtmgrpc/dtmgimp/README.md
+++ b/dtmgrpc/dtmgimp/README.md
@@ -1,2 +1,2 @@
-## 注意
-此包带imp后缀，主要被dtm内部使用，相关接口可能会发生变更，请勿使用这里的接口
\ No newline at end of file
+## Notice
+Please donot use this package, and this package should only be used in dtm internally. The interfaces are not stable, and package name has postfix "imp"
\ No newline at end of file
diff --git a/dtmgrpc/dtmgimp/types.go b/dtmgrpc/dtmgimp/types.go
index d19cd69..2b6a653 100644
--- a/dtmgrpc/dtmgimp/types.go
+++ b/dtmgrpc/dtmgimp/types.go
@@ -19,7 +19,7 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
-// GrpcServerLog 打印grpc服务端的日志
+// GrpcServerLog middleware to print server-side grpc log
 func GrpcServerLog(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
 	began := time.Now()
 	logger.Debugf("grpc server handling: %s %s", info.FullMethod, dtmimp.MustMarshalString(req))
@@ -35,7 +35,7 @@ func GrpcServerLog(ctx context.Context, req interface{}, info *grpc.UnaryServerI
 	return m, err
 }
 
-// GrpcClientLog 打印grpc调用的日志
+// GrpcClientLog middleware to print client-side grpc log
 func GrpcClientLog(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
 	logger.Debugf("grpc client calling: %s%s %v", cc.Target(), method, dtmimp.MustMarshalString(req))
 	LogDtmCtx(ctx)
diff --git a/dtmgrpc/tcc.go b/dtmgrpc/tcc.go
index bbbaef8..24a2f6a 100644
--- a/dtmgrpc/tcc.go
+++ b/dtmgrpc/tcc.go
@@ -25,9 +25,9 @@ type TccGrpc struct {
 type TccGlobalFunc func(tcc *TccGrpc) error
 
 // TccGlobalTransaction begin a tcc global transaction
-// dtm dtm服务器地址
-// gid 全局事务id
-// tccFunc tcc事务函数，里面会定义全局事务的分支
+// dtm dtm server url
+// gid global transaction id
+// tccFunc tcc busi func, define the transaction logic
 func TccGlobalTransaction(dtm string, gid string, tccFunc TccGlobalFunc) (rerr error) {
 	return TccGlobalTransaction2(dtm, gid, func(tg *TccGrpc) {}, tccFunc)
 }
@@ -40,7 +40,6 @@ func TccGlobalTransaction2(dtm string, gid string, custom func(*TccGrpc), tccFun
 	if rerr != nil {
 		return rerr
 	}
-	// 小概率情况下，prepare成功了，但是由于网络状况导致上面Failure，那么不执行下面defer的内容，等待超时后再回滚标记事务失败，也没有问题
 	defer dtmimp.DeferDo(&rerr, func() error {
 		return dtmgimp.DtmGrpcCall(&tcc.TransBase, "Submit")
 	}, func() error {
diff --git a/dtmgrpc/xa.go b/dtmgrpc/xa.go
index a7bbebb..37f7cfc 100644
--- a/dtmgrpc/xa.go
+++ b/dtmgrpc/xa.go
@@ -57,7 +57,7 @@ func NewXaGrpcClient(server string, mysqlConf dtmcli.DBConf, notifyURL string) *
 	return xa
 }
 
-// HandleCallback 处理commit/rollback的回调
+// HandleCallback handle commit/rollback callback
 func (xc *XaGrpcClient) HandleCallback(ctx context.Context) (*emptypb.Empty, error) {
 	tb := dtmgimp.TransBaseFromGrpc(ctx)
 	return &emptypb.Empty{}, xc.XaClientBase.HandleCallback(tb.Gid, tb.BranchID, tb.Op)
diff --git a/dtmsvr/config/config.go b/dtmsvr/config/config.go
index 750af5e..a72bea7 100644
--- a/dtmsvr/config/config.go
+++ b/dtmsvr/config/config.go
@@ -84,7 +84,7 @@ type configType struct {
 	Log                           Log          `yaml:"Log"`
 }
 
-// Config 配置
+// Config config
 var Config = configType{}
 
 // MustLoadConfig load config from env and file
diff --git a/dtmsvr/storage/sql/sql.go b/dtmsvr/storage/sql/sql.go
index d87297a..c15c7fc 100644
--- a/dtmsvr/storage/sql/sql.go
+++ b/dtmsvr/storage/sql/sql.go
@@ -103,7 +103,7 @@ func (s *Store) MaySaveNewTrans(global *storage.TransGlobalStore, branches []sto
 		dbr := db.Must().Clauses(clause.OnConflict{
 			DoNothing: true,
 		}).Create(global)
-		if dbr.RowsAffected <= 0 { // 如果这个不是新事务，返回错误
+		if dbr.RowsAffected <= 0 { // not a new trans, return
 			return storage.ErrUniqueConflict
 		}
 		if len(branches) > 0 {
diff --git a/dtmsvr/trans_status.go b/dtmsvr/trans_status.go
index 2c1c16a..768a881 100644
--- a/dtmsvr/trans_status.go
+++ b/dtmsvr/trans_status.go
@@ -67,7 +67,7 @@ func (t *TransGlobal) changeBranchStatus(b *TransBranch, status string, branchPo
 		GetStore().LockGlobalSaveBranches(t.Gid, t.Status, []TransBranch{*b}, branchPos)
 		logger.Infof("LockGlobalSaveBranches ok: gid: %s old status: %s branches: %s",
 			b.Gid, dtmcli.StatusPrepared, b.String())
-	} else { // 为了性能优化，把branch的status更新异步化
+	} else { // for better performance, batch the updates of branch status
 		updateBranchAsyncChan <- branchStatus{id: b.ID, gid: t.Gid, status: status, finishTime: &now}
 	}
 }
diff --git a/dtmutil/db.go b/dtmutil/db.go
index 86973b2..97bfefa 100644
--- a/dtmutil/db.go
+++ b/dtmutil/db.go
@@ -78,7 +78,7 @@ func (op *tracePlugin) Initialize(db *gorm.DB) (err error) {
 	afterName := "cb_after"
 
 	logger.Debugf("installing db plugin: %s", op.Name())
-	// 开始前
+	// before
 	_ = db.Callback().Create().Before("gorm:before_create").Register(beforeName, before)
 	_ = db.Callback().Query().Before("gorm:query").Register(beforeName, before)
 	_ = db.Callback().Delete().Before("gorm:before_delete").Register(beforeName, before)
@@ -86,7 +86,7 @@ func (op *tracePlugin) Initialize(db *gorm.DB) (err error) {
 	_ = db.Callback().Row().Before("gorm:row").Register(beforeName, before)
 	_ = db.Callback().Raw().Before("gorm:raw").Register(beforeName, before)
 
-	// 结束后
+	// after
 	_ = db.Callback().Create().After("gorm:after_create").Register(afterName, after)
 	_ = db.Callback().Query().After("gorm:after_query").Register(afterName, after)
 	_ = db.Callback().Delete().After("gorm:after_delete").Register(afterName, after)
diff --git a/dtmutil/utils.go b/dtmutil/utils.go
index 849b539..9c78bb2 100644
--- a/dtmutil/utils.go
+++ b/dtmutil/utils.go
@@ -112,7 +112,7 @@ func MustGetwd() string {
 	return wd
 }
 
-// GetSQLDir 获取调用该函数的caller源代码的目录，主要用于测试时，查找相关文件
+// GetSQLDir get sql scripts dir, used in test
 func GetSQLDir() string {
 	wd := MustGetwd()
 	if filepath.Base(wd) == "test" {
diff --git a/helper/bench/main.go b/helper/bench/main.go
index e8cb94c..058db3e 100644
--- a/helper/bench/main.go
+++ b/helper/bench/main.go
@@ -47,8 +47,8 @@ func main() {
 	} else {
 		hintAndExit()
 	}
-	dtmsvr.StartSvr()              // 启动dtmsvr的api服务
-	go dtmsvr.CronExpiredTrans(-1) // 启动dtmsvr的定时过期查询
-	svr.StartSvr()                 // 启动bench服务
+	dtmsvr.StartSvr()
+	go dtmsvr.CronExpiredTrans(-1)
+	svr.StartSvr()
 	select {}
 }
diff --git a/main.go b/main.go
index f0fcd98..813e920 100644
--- a/main.go
+++ b/main.go
@@ -69,7 +69,7 @@ func main() {
 	}
 	_, _ = maxprocs.Set(maxprocs.Logger(logger.Infof))
 	registry.WaitStoreUp()
-	dtmsvr.StartSvr()              // 启动dtmsvr的api服务
-	go dtmsvr.CronExpiredTrans(-1) // 启动dtmsvr的定时过期查询
+	dtmsvr.StartSvr()              // start dtmsvr api
+	go dtmsvr.CronExpiredTrans(-1) // start dtmsvr cron job
 	select {}
 }
diff --git a/sqls/dtmsvr.storage.tdsql.sql b/sqls/dtmsvr.storage.tdsql.sql
index 09cf816..2f6e42d 100644
--- a/sqls/dtmsvr.storage.tdsql.sql
+++ b/sqls/dtmsvr.storage.tdsql.sql
@@ -4,38 +4,37 @@ CREATE DATABASE IF NOT EXISTS dtm
 drop table IF EXISTS dtm.trans_global;
 CREATE TABLE if not EXISTS dtm.trans_global (
   `id` bigint(22) NOT NULL AUTO_INCREMENT,
-  `gid` varchar(128) NOT NULL COMMENT '事务全局id',
-  `trans_type` varchar(45) not null COMMENT '事务类型: saga | xa | tcc | msg',
-  -- `data` TEXT COMMENT '事务携带的数据', -- 影响性能，不必要存储
-  `status` varchar(12) NOT NULL COMMENT '全局事务的状态 prepared | submitted | aborting | finished | rollbacked',
-  `query_prepared` varchar(128) NOT NULL COMMENT 'prepared状态事务的查询api',
-  `protocol` varchar(45) not null comment '通信协议 http | grpc',
+  `gid` varchar(128) NOT NULL COMMENT 'global transaction id',
+  `trans_type` varchar(45) not null COMMENT 'transaction type: saga | xa | tcc | msg',
+  `status` varchar(12) NOT NULL COMMENT 'tranaction status: prepared | submitted | aborting | finished | rollbacked',
+  `query_prepared` varchar(128) NOT NULL COMMENT 'url to check for 2-phase message',
+  `protocol` varchar(45) not null comment 'protocol: http | grpc | json-rpc',
   `create_time` datetime DEFAULT NULL,
   `update_time` datetime DEFAULT NULL,
-  `commit_time` datetime DEFAULT NULL,
   `finish_time` datetime DEFAULT NULL,
   `rollback_time` datetime DEFAULT NULL,
-  `options` varchar(256) DEFAULT '',
-  `custom_data` varchar(256) DEFAULT '',
-  `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',
+  `options` varchar(1024) DEFAULT 'options for transaction like: TimeoutToFail, RequestTimeout',
+  `custom_data` varchar(256) DEFAULT '' COMMENT 'custom data for transaction',
+  `next_cron_interval` int(11) default null comment 'next cron interval. for use of cron job',
+  `next_cron_time` datetime default null comment 'next time to process this trans. for use of cron job',
+  `owner` varchar(128) not null default '' comment 'who is locking this trans',
+  `ext_data` TEXT comment 'extended data for this trans',
   PRIMARY KEY (`id`,`gid`),
   UNIQUE KEY `id` (`id`,`gid`),
   UNIQUE KEY `gid` (`gid`),
   key `owner`(`owner`),
-  key `status_next_cron_time` (`status`, `next_cron_time`) comment '这个索引用于查询超时的全局事务，能够合理的走索引'
+  key `status_next_cron_time` (`status`, `next_cron_time`) comment 'cron job will use this index to query trans'
 ) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4 shardkey=gid;
 drop table IF EXISTS dtm.trans_branch_op;
 CREATE TABLE IF NOT EXISTS dtm.trans_branch_op (
   `id` bigint(22) NOT NULL AUTO_INCREMENT,
-  `gid` varchar(128) NOT NULL COMMENT '事务全局id',
-  `url` varchar(128) NOT NULL COMMENT '动作关联的url',
-  `data` TEXT COMMENT '请求所携带的数据',
-  `bin_data` BLOB COMMENT 'grpc的二进制数据',
-  `branch_id` VARCHAR(128) NOT NULL COMMENT '事务分支ID',
-  `op` varchar(45) NOT NULL COMMENT '事务分支类型 saga_action | saga_compensate | xa',
-  `status` varchar(45) NOT NULL COMMENT '步骤的状态 submitted | finished | rollbacked',
+  `gid` varchar(128) NOT NULL COMMENT 'global transaction id',
+  `url` varchar(128) NOT NULL COMMENT 'the url of this op',
+  `data` TEXT COMMENT 'request body, depreceated',
+  `bin_data` BLOB COMMENT 'request body',
+  `branch_id` VARCHAR(128) NOT NULL COMMENT 'transaction branch ID',
+  `op` varchar(45) NOT NULL COMMENT 'transaction operation type like: action | compensate | try | confirm | cancel',
+  `status` varchar(45) NOT NULL COMMENT 'transaction op status: prepared | succeed | failed',
   `finish_time` datetime DEFAULT NULL,
   `rollback_time` datetime DEFAULT NULL,
   `create_time` datetime DEFAULT NULL,
diff --git a/test/busi/quick_start.go b/test/busi/quick_start.go
index 09d84ce..6d57af5 100644
--- a/test/busi/quick_start.go
+++ b/test/busi/quick_start.go
@@ -9,7 +9,7 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-// 事务参与者的服务地址
+// busi address
 const qsBusiAPI = "/api/busi_start"
 const qsBusiPort = 8082
 
@@ -57,14 +57,14 @@ const dtmServer = "http://localhost:36789/api/dtmsvr"
 
 // QsFireRequest quick start: fire request
 func QsFireRequest() string {
-	req := &gin.H{"amount": 30} // 微服务的载荷
-	// DtmServer为DTM服务的地址
+	req := &gin.H{"amount": 30} // load of micro-service
+	// DtmServer is the url of dtm
 	saga := dtmcli.NewSaga(dtmServer, dtmcli.MustGenGid(dtmServer)).
-		// 添加一个TransOut的子事务，正向操作为url: qsBusi+"/TransOut"， 逆向操作为url: qsBusi+"/TransOutCompensate"
+		// add a TransOut subtraction，forward operation with url: qsBusi+"/TransOut", reverse compensation operation with url: qsBusi+"/TransOutCompensate"
 		Add(qsBusi+"/TransOut", qsBusi+"/TransOutCompensate", req).
-		// 添加一个TransIn的子事务，正向操作为url: qsBusi+"/TransOut"， 逆向操作为url: qsBusi+"/TransInCompensate"
+		// add a TransIn subtraction, forward operation with url: qsBusi+"/TransIn", reverse compensation operation with url: qsBusi+"/TransInCompensate"
 		Add(qsBusi+"/TransIn", qsBusi+"/TransInCompensate", req)
-	// 提交saga事务，dtm会完成所有的子事务/回滚所有的子事务
+	// submit the created saga transaction，dtm ensures all subtractions either complete or get revoked
 	err := saga.Submit()
 
 	if err != nil {
diff --git a/test/busi/utils.go b/test/busi/utils.go
index 8f68373..de5a490 100644
--- a/test/busi/utils.go
+++ b/test/busi/utils.go
@@ -100,7 +100,7 @@ func oldWrapHandler(fn func(*gin.Context) (interface{}, error)) gin.HandlerFunc
 			return fn(c)
 		}()
 		var b = []byte{}
-		if resp, ok := r.(*resty.Response); ok { // 如果是response，则取出body直接处理
+		if resp, ok := r.(*resty.Response); ok { // if it is a response，the get the body
 			b = resp.Body()
 		} else if err == nil {
 			b, err = json.Marshal(r)
diff --git a/test/tcc_barrier_test.go b/test/tcc_barrier_test.go
index c55308d..3774b31 100644
--- a/test/tcc_barrier_test.go
+++ b/test/tcc_barrier_test.go
@@ -74,7 +74,7 @@ func runTestTccBarrierDisorder(t *testing.T, store string) {
 		tryURL := Busi + "/TccBTransOutTry"
 		confirmURL := Busi + "/TccBTransOutConfirm"
 		cancelURL := Busi + "/TccBSleepCancel"
-		// 请参见子事务屏障里的时序图，这里为了模拟该时序图，手动拆解了callbranch
+		// refer to time diagram for barrier, here we simulate it
 		branchID := tcc.NewSubBranchID()
 		busi.SetSleepCancelHandler(func(c *gin.Context) interface{} {
 			res := busi.TccBarrierTransOutCancel(c)
@@ -85,7 +85,7 @@ func runTestTccBarrierDisorder(t *testing.T, store string) {
 			logger.Debugf("disorderHandler after cancel return read")
 			return res
 		})
-		// 注册子事务
+		// register tcc branch
 		resp, err := dtmimp.RestyClient.R().
 			SetBody(map[string]interface{}{
 				"gid":                tcc.Gid,
@@ -124,7 +124,7 @@ func runTestTccBarrierDisorder(t *testing.T, store string) {
 				"op":         dtmcli.BranchTry,
 			}).
 			Post(tryURL)
-		assert.True(t, strings.Contains(r.String(), dtmcli.ResultSuccess)) // 这个是悬挂操作，为了简单起见，依旧让他返回成功
+		assert.True(t, strings.Contains(r.String(), dtmcli.ResultSuccess)) // dangle op, return success
 		logger.Debugf("cronFinished read")
 		<-cronFinished
 		<-cronFinished
diff --git a/test/xa_test.go b/test/xa_test.go
index b276340..6da797a 100644
--- a/test/xa_test.go
+++ b/test/xa_test.go
@@ -49,7 +49,7 @@ func TestXaDuplicate(t *testing.T) {
 			_, err = dtmimp.DBExec(sdb, "xa recover")
 			assert.Nil(t, err)
 		}
-		_, err = dtmimp.DBExec(sdb, dtmimp.GetDBSpecial().GetXaSQL("commit", gid+"-01")) // 先把某一个事务提交，模拟重复请求
+		_, err = dtmimp.DBExec(sdb, dtmimp.GetDBSpecial().GetXaSQL("commit", gid+"-01")) // simulate repeated request
 		assert.Nil(t, err)
 		return xa.CallBranch(req, busi.Busi+"/TransInXa")
 	})