thanks a lot . I can use usb cable with sdk mode to connect the pc to open a recovery terminal by ssh,

and then config N9 to connect the internet by the followings:
on N9 :
devel-su
/sbin/route add default gw 192.168.2.14
and edit /etc/resov.conf nameser ,
nameserver "the gateway of PC net"

on PC(ubuntu12.04 lts)
su
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo "1" > /proc/sys/net/ipv4/ip_forward

and it works queit well!
user@RM696:/usr/bin$ ping www.qq.com
PING www.qq.com (183.60.15.153): 56 data bytes
64 bytes from 183.60.15.153: seq=0 ttl=55 time=63.416 ms
64 bytes from 183.60.15.153: seq=1 ttl=55 time=3.265 ms
64 bytes from 183.60.15.153: seq=2 ttl=55 time=6.897 ms
64 bytes from 183.60.15.153: seq=3 ttl=55 time=6.744 m

i reinstall a new version of meegotouchhome ,which :
http://mirror.thecust.net/harmattan-...eegotouchhome/
but when i have finished it , it still cannot work.
where can i find the source of it ?maybe i can install a new one by apt-get install