You don't state whether your girlfriend is in the US or in China. If she is in the US and entered on a visa, then once you marry, you and she can file for her Permanent Residency. If she in China, you have several options: you can file a fiancee visa petition for her and once it's approved she can obtain a fiancee visa from the US Consulate in China to use to come to the US and marry. If you don't want to do that, then you can marry her in China or elsewhere and then file a relative petitition (I-130) and then another petition (K-3) to allow her to cvome to the US and do her waiting here for the I-130 to be approved. Once approved, she can file for Permanent Residency in the US. What you don't want to do is to have her apply for a Visitor's Visa with the intent to travel here and then marry.
Best to you both!
Answered on May 16th, 2013 at 4:26 PM