I am from China and was married in June of 2012 we were here for only 1 week and went back to China. I this marriage legal? is an anulment an option?

The short answers are "yes" and "yes."  If you pulled a license, went through a ceremony, etc., the marriage is "legal," and if you qualify under the law, annulment is an option.  We do a number of annulments for foreign nationals in similar circumstances every year.  Since the marriage was in Nevada, no physical appearance, and no establishment of Nevada residency, should be required for an annulment proceeding (i.e., neither party should have to come back to or be here), if the clients otherwise qualify. With some basic information, I could analyze the case and tell you whether an annulment here is likely to succeed: Where is everyone involved living now?  How likely is it that we will get cooperation, or active opposition, from the other party? With those answers, and some basic background facts, I can tell you what we can do, and (usually) how long it is likely to take, and how much it is likely to cost.  The background information necessary is explained on two pages of our web site: http://willicklawgroup.com/annulment/.  http://willicklawgroup.com/uncontested-annulment/ I suggest that you closely review the questions posted there, and the information about how the process works, and let us know whether you have any further questions.