diff --git a/conf.sample.yml b/conf.sample.yml
index c0f244a..6ce8e73 100644
--- a/conf.sample.yml
+++ b/conf.sample.yml
@@ -5,12 +5,12 @@
 ### MicroService.EndPoint => MICRO_SERVICE_END_POINT
 #####################################################################
 
-Store: # specify which engine to store trans status
-  Driver: 'mysql'
-  Host: 'localhost'
-  User: 'root'
-  Password: '123456'
-  Port: 3306
+# Store: # specify which engine to store trans status
+#   Driver: 'mysql'
+#   Host: 'localhost'
+#   User: 'root'
+#   Password: '123456'
+#   Port: 3306
 #   Driver: 'boltdb' # default store engine
 
 #   Driver: 'redis'
@@ -37,11 +37,11 @@ Store: # specify which engine to store trans status
 #   SuccessDataExpire: 86400 # successful Trans data will expire in 1 days. only for redis.
 #   RedisPrefix: '{a}' # default value is '{a}'. Redis storage prefix. store data to only one slot in cluster
 
-MicroService:
-   Driver: 'dtm-driver-nacos' # name of the driver to handle register/discover
-   Target: '1.14.127.29:8848' # register dtm server to this url
-   EndPoint: '192.168.101.9:36789'
-   OptionsJson: '{"username": "nacos", "password": "nacos", "namespaceId": "c3dc917d-906a-429d-90a9-85012b41014e"}' # micro service other config message, example: '{"username": "nacos", "password": "nacos"}'
+# MicroService:
+#    Driver: 'dtm-driver-nacos' # name of the driver to handle register/discover
+#    Target: '127.0.0.1:8848' # register dtm server to this url
+#    EndPoint: '127.0.0.1:36789'
+#    OptionsJson: '{"username": "nacos", "password": "nacos", "namespaceId": "c3dc917d-906a-429d-90a9-85012b41067e"}' # micro service other config message, example: '{"username": "nacos", "password": "nacos"}'
 
 ### the unit of following configurations is second
 # TransCronInterval: 3 # the interval to poll unfinished global transaction for every dtm process
@@ -49,15 +49,15 @@ MicroService:
 # RetryInterval: 10 # the subtrans branch will be retried after this interval
 # RequestTimeout: 3 # the timeout of HTTP/gRPC request in dtm
 
-LogLevel: 'info'              # default: info. can be debug|info|warn|error
-Log:
-   Outputs: 'stderr'           # default: stderr, split by ",", you can append files to Outputs if need. example:'stderr,/tmp/test.log'
-   RotationEnable: 0           # default: 0
-   RotationConfigJSON: '{}'    # example: '{"maxsize": 100, "maxage": 0, "maxbackups": 0, "localtime": false, "compress": false}'
-
-HttpPort: 36789
-GrpcPort: 36790
-JsonRpcPort: 36791
+# LogLevel: 'info'              # default: info. can be debug|info|warn|error
+# Log:
+#    Outputs: 'stderr'           # default: stderr, split by ",", you can append files to Outputs if need. example:'stderr,/tmp/test.log'
+#    RotationEnable: 0           # default: 0
+#    RotationConfigJSON: '{}'    # example: '{"maxsize": 100, "maxage": 0, "maxbackups": 0, "localtime": false, "compress": false}'
+#
+# HttpPort: 36789
+# GrpcPort: 36790
+# JsonRpcPort: 36791
 
 ### advanced options
 # UpdateBranchAsyncGoroutineNum: 1 # num of async goroutine to update branch status
diff --git a/dtmsvr/config/config.go b/dtmsvr/config/config.go
index 00d9684..ac9cf6f 100644
--- a/dtmsvr/config/config.go
+++ b/dtmsvr/config/config.go
@@ -24,7 +24,7 @@ const (
 
 // MicroService config type for micro service
 type MicroService struct {
-	Driver      string `yaml:"Driver" default:"dtm-driver-nacos"`
+	Driver      string `yaml:"Driver" default:"default"`
 	Target      string `yaml:"Target"`
 	EndPoint    string `yaml:"EndPoint"`
 	OptionsJson string `yaml:"OptionsJson"`
diff --git a/main.go b/main.go
index 49aba15..44dcd71 100644
--- a/main.go
+++ b/main.go
@@ -60,7 +60,6 @@ func main() {
 		return
 	}
 	logger.Infof("dtm version is: %s", Version)
-	*confFile = "conf.sample.yml"
 	config.MustLoadConfig(*confFile)
 	conf := &config.Config
 	if *isDebug {