marriage requirement in China

Do you mean to get married with a Chinese and register your marriage in China? If yes, you shall have the divorce certificate be certified/authenticated together with the single certificate if you was married before. They both needed to be translated into Chinese. Other documents required is your birth certificate, Passport and photo. If you want to bring her into US after marriage, you can apply for her a visa to US. For details, you'd better contact your immigration control.