Problems raised from China's order
I've tried many ways to solve the problem to make an order from China.
1st problem needed to be solved is to find a reliable vpn. Google doesn't accept any visits from China. If your isp is figured as Chinese one, Google play will tell you that the districts are denied to make an order. So vpn is indispensable for ordering nexus 7.
2nd problem is to find a friend who live in outside of China.
It took me about 3 weeks to finish an order. Wish me good luck. I will update my order for the reference.