thanks for your reply, i can not find the device in hardware, but i finally sort it out, it is due to not enough power support to the USB, i dono why i have plugged the USB in my computer's back panel also, not work, then i tried to put it back to USB hub, firstly also not working, but i tried to use the power adapter, it can scan it la....
i dono why the back panel not working, it should have enough power there -_-||| |