diff --git a/cos/conf.go b/cos/conf.go
index b8724d7..516c013 100644
--- a/cos/conf.go
+++ b/cos/conf.go
@@ -17,6 +17,7 @@ type Conf struct {
 	RetryTimes int
 	UA         string
 	Domain     string
+	Bucket     string
 }
 
 func getDefaultConf() *Conf {
diff --git a/cos/option.go b/cos/option.go
index 0c4b1cd..d6bc8af 100644
--- a/cos/option.go
+++ b/cos/option.go
@@ -6,4 +6,5 @@ type Option struct {
 	SecretKey string `mapstructure:"secret_key" json:"secret_key"`
 	Region    string `mapstructure:"region" json:"region"`
 	Domain    string `mapstructure:"domain" json:"domain"`
+	Bucket    string `mapstructure:"bucket" json:"bucket"`
 }
diff --git a/cos/setup_test.go b/cos/setup_test.go
index 85a82c1..6d24b95 100644
--- a/cos/setup_test.go
+++ b/cos/setup_test.go
@@ -12,7 +12,8 @@ const (
 )
 
 func setUp() {
-	client = New(&Option{"1254217795", "AKIDkOq6C6qLgstiMqmGF2d3HKBpHYeZlpAH", "Rny65tVv9BQuHUVKxOehZFqJbifYN7g3", "ap-chengdu", "mycloud.com"})
+	client = New(&Option{"1254217795", "AKIDkOq6C6qLgstiMqmGF2d3HKBpHYeZlpAH", "Rny65tVv9BQuHUVKxOehZFqJbifYN7g3", "ap-chengdu", "myqcloud.com", "omnipay-entity-dev"})
+
 }
 
 func assert(want, condition, got interface{}) {