diff --git a/common/config.go b/common/config.go
index 7744323..5be36d3 100644
--- a/common/config.go
+++ b/common/config.go
@@ -30,8 +30,8 @@ type Store struct {
 	MaxOpenConns    int64  `yaml:"MaxOpenConns" default:"500"`
 	MaxIdleConns    int64  `yaml:"MaxIdleConns" default:"500"`
 	ConnMaxLifeTime int64  `yaml:"ConnMaxLifeTime" default:"5"`
-	RedisExpire     int64  `yaml:"RedisExpire" default:"604800"` // Trans data will expire in 7 days
-	RedisPrefix     string `yaml:"RedisPrefix" default:"{}"`     // Redis storage prefix. stored to only one slot in cluster
+	DataExpire      int64  `yaml:"DataExpire" default:"604800"` // Trans data will expire in 7 days. only for redis/boltdb.
+	RedisPrefix     string `yaml:"RedisPrefix" default:"{}"`    // Redis storage prefix. store data to only one slot in cluster
 }
 
 func (s *Store) IsDB() bool {
diff --git a/conf.sample.yml b/conf.sample.yml
index 6c5919f..3d698c0 100644
--- a/conf.sample.yml
+++ b/conf.sample.yml
@@ -24,6 +24,10 @@ Store: # specify which engine to store trans status
 #   MaxIdleConns: 500
 #   ConnMaxLifeTime 5 # default value is 5 (minutes)
 
+### flollowing config is only for some Driver
+#   DataExpire: 604800 # Trans data will expire in 7 days. only for redis/boltdb.
+#   RedisPrefix: '{}' # default value is '{}'. Redis storage prefix. store data to only one slot in cluster
+
 # MicroService:
 #   Driver: 'dtm-driver-gozero' # name of the driver to handle register/discover
 #   Target: 'etcd://localhost:2379/dtmservice' # register dtm server to this url
diff --git a/dtmsvr/storage/redis.go b/dtmsvr/storage/redis.go
index 1b225d1..5bc751e 100644
--- a/dtmsvr/storage/redis.go
+++ b/dtmsvr/storage/redis.go
@@ -82,7 +82,7 @@ type argList struct {
 
 func newArgList() *argList {
 	a := &argList{}
-	return a.AppendRaw(config.Store.RedisPrefix).AppendObject(config.Store.RedisExpire)
+	return a.AppendRaw(config.Store.RedisPrefix).AppendObject(config.Store.DataExpire)
 }
 
 func (a *argList) AppendRaw(v interface{}) *argList {