How long can China citizens return to China with American green cards?

In theory, you can return to China if you get an American green card. However, it is not recommended to leave the United States for more than half a year, otherwise the customs will encounter trouble when entering the customs next time.

To maintain the validity of the American green card, you must enter the United States at least once every six months, that is, you can return to China for up to six months, otherwise the US Immigration Service will wonder if you really want to become a permanent resident of the United States. However, if it is really impossible to return to the United States once a year under special circumstances, you can apply for a re-entry permit (valid for 1-2 years) to return to the United States one year later. Of course, there is no problem if you travel to and from the United States many times a year.