Fine, i resolve this issus. WTF China Great FireWall!!
I use VPN to connect to USA, and restart the client, then it works.
Here is some IPs I connected, hope it's usefull:
188.23.207.162
62.163.9.155
77.110.45.131
54.217.246.73
37.110.71.111
66.216.225.56
69.247.56.61
219.138.167.53

same to you.
i use "addnode=IPs" in my conf file, but still useless. Anyone can help us?