I used American Express, MNBA credit card. I used them in Beijing. I recommend you take some cash with you and get some currency in the airports. Couple of hundred dollars should be easy to carry around, just be careful.

Still have no sense about it. Could you tell me how to start or open an account? Where should I look for it?

有bank of america的分支的，至少在上海有，好像还离大使馆不远的地方就有，不知道mm在那个城市。