diff --git a/balance/poll.go b/balance/poll.go
index 17368c3..aea081a 100644
--- a/balance/poll.go
+++ b/balance/poll.go
@@ -26,7 +26,8 @@ func NewPoll(serverList []*define.ServerNode) (IBalance, error) {
 	}
 	return &Poll{
 		base: base{
-			lock: &sync.RWMutex{},
+			lock:      &sync.RWMutex{},
+			severList: serverList,
 		},
 		currentServerIndex: 0,
 	}, nil