It works. Someone said it is hard and have to change RT5350 wifi driver code, but I did not change any code, maybe the developers of openwrt already fix that? 🙂

SSID for AP mode is VoCore
SSID for STA mode(my house router) is VongerWifi

That is not hard to setup:

First, enable STA mode, add two lines to the end of /etc/config/network.

config interface wwan
	option proto 'dhcp'

Then change /etc/config/wireless

config wifi-device  radio0
	option type     mac80211
	option channel  11
	option hwmode	11ng
	option path	'10180000.wmac'
	list ht_capab	GF
	list ht_capab	SHORT-GI-20
	list ht_capab	SHORT-GI-40
	list ht_capab	RX-STBC1
	option htmode	HT20

config wifi-iface
	option device   radio0
	option network  lan
	option mode     ap
	option ssid     VoCore
	option encryption none

config wifi-iface
	option device   radio0
	option network  wwan
	option mode     sta
	option ssid     VongerWifi
	option encryption psk2
	option key      PasswordForWifi

If your house router has taken 192.168.1.1 as its IP address, you have to change the setting in /etc/config/network, set openwrt ip to other, so it will not conflict with your house router in STA mode. The ip in example is 192.168.61.1.

config interface 'lan'
	option ifname 'eth0.1'
	option type 'bridge'
	option proto 'static'
	option ipaddr '192.168.61.1'
	option netmask '255.255.255.0'
	option ip6assign '60'

After that, looks everything works fine. My computer is able to connect to VoCore and VoCore is able to connect to internet through my wifi. But the only problem is my computer can not connect to internet through VoCore, maybe I have to setup a route on the board, will study on that later.