diff --git a/dtmsvr/config/config.go b/dtmsvr/config/config.go
index 30f0115..35815f2 100644
--- a/dtmsvr/config/config.go
+++ b/dtmsvr/config/config.go
@@ -95,7 +95,7 @@ type Type struct {
 	JSONRPCPort                   int64            `yaml:"JsonRpcPort" default:"36791"`
 	MicroService                  MicroService     `yaml:"MicroService"`
 	HTTPMicroService              HTTPMicroService `yaml:"HttpMicroService"`
-	UpdateBranchSync              int64            `yaml:"UpdateBranchSync"`
+	UpdateBranchSync              int64            `yaml:"UpdateBranchSync" default:"1"`
 	UpdateBranchAsyncGoroutineNum int64            `yaml:"UpdateBranchAsyncGoroutineNum" default:"1"`
 	LogLevel                      string           `yaml:"LogLevel" default:"info"`
 	Log                           Log              `yaml:"Log"`
diff --git a/dtmsvr/config/config_test.go b/dtmsvr/config/config_test.go
index 84425dc..aced94b 100644
--- a/dtmsvr/config/config_test.go
+++ b/dtmsvr/config/config_test.go
@@ -19,6 +19,9 @@ func TestLoadFromEnv(t *testing.T) {
 
 func TestLoadConfig(t *testing.T) {
 	MustLoadConfig("../../conf.sample.yml")
+
+	//assert default value
+	assert.Equal(t, int64(1), Config.UpdateBranchSync)
 }
 func TestCheckConfig(t *testing.T) {
 	conf := Config