Now I'm going to marry a China man with a green card. Can I go to America with him? What are the procedures? How long will it take?

First of all, the other party is not a local, only has a green card, and I don't know whether he is a China passport or an American passport. This situation is much more difficult than finding an American man.

If he is an American citizen with an American passport and you want to apply for a marriage visa, he should apply locally, and then you can apply for a marriage visa in China. This visa is time-limited, and you must get married within the specified time.

Immigration will also investigate, and it will be a surprise inspection every three days. For example, where are all the things at home, and even what color underwear your other half wears may be asked for fear of your fake marriage.