opkg update

opkg install ip ipset resolveip iptables-mod-tproxy resolveip libopenssl luci-i18n-base-zh-cn

reboot

opkg update   # redo

wget https://github.com/*/ChinaDNS/releases/download/1.3.2/ChinaDNS_1.3.2_ar71xx.ipk

wget http://openwrt-dist.sourceforge.net/releases/ar71xx/packages/*-libev-spec_2.4.0-1_ar71xx.ipk

wget http://openwrt-dist.sourceforge.net/releases/luci/packages/luci-app-chinadns_1.3.6-1_all.ipk

wget http://openwrt-dist.sourceforge.net/releases/luci/packages/luci-app-*-spec_1.3.6-1_all.ipk

opkg install ChinaDNS_1.3.2_ar71xx.ipk

opkg install *-libev-spec_2.4.0-1_ar71xx.ipk

opkg install luci-app-chinadns_1.3.6-1_all.ipk #chinadns的web界面，不过我的安装没有生效。web上没有出现菜单，但不影响使用

opkg install luci-app-*-spec_1.3.6-1_all.ipk

/etc/init.d/chinadns enable

/etc/init.d/* enable

wget -O- 'http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest' | awk -F\| '/CN\|ipv4/ { printf("%s/%d\n", $4, 32-log($5)/log(2)) }' > /etc/ignore.list

vim /etc/config/network

config interface 'wan'

        option ifname 'eth0'

        option proto 'dhcp'

        option peerdns '0'

        option dns '8.8.8.8 8.8.4.4 223.5.5.5'

详情参考：

http://blog.91python.com/openwrt/*/2015/10/15/tp720n-openwrt-shadowscoks.html

http://blog.91python.com/openwrt/*/2015/10/15/tp720n-openwrt-shadowscoks.html