diff --git a/dtmgrpc/dtmgimp/grpc_clients.go b/dtmgrpc/dtmgimp/grpc_clients.go
index b299b9a..44e755b 100644
--- a/dtmgrpc/dtmgimp/grpc_clients.go
+++ b/dtmgrpc/dtmgimp/grpc_clients.go
@@ -26,9 +26,8 @@ func (cb rawCodec) Marshal(v interface{}) ([]byte, error) {
 func (cb rawCodec) Unmarshal(data []byte, v interface{}) error {
 	ba, ok := v.(*[]byte)
 	dtmimp.PanicIf(!ok, fmt.Errorf("please pass in *[]byte"))
-	for _, byte := range data {
-		*ba = append(*ba, byte)
-	}
+	*ba = append(*ba, data...)
+
 	return nil
 }
 
@@ -36,6 +35,7 @@ func (cb rawCodec) Name() string { return "dtm_raw" }
 
 var normalClients, rawClients sync.Map
 
+// ClientInterceptors declares grpc.UnaryClientInterceptors slice
 var ClientInterceptors = []grpc.UnaryClientInterceptor{}
 
 // MustGetDtmClient 1
diff --git a/dtmgrpc/tcc.go b/dtmgrpc/tcc.go
index 3f39676..0fd5b7d 100644
--- a/dtmgrpc/tcc.go
+++ b/dtmgrpc/tcc.go
@@ -75,6 +75,9 @@ func TccFromGrpc(ctx context.Context) (*TccGrpc, error) {
 func (t *TccGrpc) CallBranch(busiMsg proto.Message, tryURL string, confirmURL string, cancelURL string, reply interface{}) error {
 	branchID := t.NewSubBranchID()
 	bd, err := proto.Marshal(busiMsg)
+	if err != nil {
+		return err
+	}
 	_, err = dtmgimp.MustGetDtmClient(t.Dtm).RegisterBranch(context.Background(), &dtmgpb.DtmBranchRequest{
 		Gid:         t.Gid,
 		TransType:   t.TransType,
diff --git a/dtmgrpc/type.go b/dtmgrpc/type.go
index d166b5c..f900170 100644
--- a/dtmgrpc/type.go
+++ b/dtmgrpc/type.go
@@ -29,6 +29,7 @@ func UseDriver(driverName string) error {
 	return dtmdriver.Use(driverName)
 }
 
+// AddUnaryInterceptor adds grpc.UnaryClientInterceptor
 func AddUnaryInterceptor(interceptor grpc.UnaryClientInterceptor) {
 	dtmgimp.ClientInterceptors = append(dtmgimp.ClientInterceptors, interceptor)
 }
diff --git a/main.go b/main.go
index 013441d..1b088e1 100644
--- a/main.go
+++ b/main.go
@@ -25,6 +25,7 @@ import (
 	_ "github.com/dtm-labs/dtmdriver-protocol1"
 )
 
+// Version declares version info
 var Version string
 
 func version() {
@@ -63,7 +64,7 @@ func main() {
 	if *isReset {
 		dtmsvr.PopulateDB(false)
 	}
-	maxprocs.Set(maxprocs.Logger(logger.Infof))
+	_, _ = 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