If the husband has a green card in the United States and a job, but no immigrants, only a green card, can the wife in China take it out?

You can't take it out. You have to help your wife apply for the immigration procedure of "green card spouse" first. According to the current progress, it will take three years, plus the procedures to be followed, four years should be enough. During this period, the wife can't go out, but once the immigration formalities are successfully completed, the wife will get a green card for 10 years. It is up to her to decide whether to be naturalized or not. In any case, if she has lived in the United States long enough, she will be eligible to become an American citizen.

LG has to help his wife submit an application form in the United States first, starting from here, step by step.