If my child is under 18 and has received a U.S. green card, can he return to China to study?

You can study when you return to China. There is no problem with China. But your child only has a green card. The green card cannot stay overseas for a long time. He needs to stay in the United States for a certain period of time every year. Otherwise, the Immigration Bureau will think that he has no intention to stay in the United States and confiscate the green card. In fact, why did you go back to China to study if you have a green card? Wouldn’t it be great to study in the United States? Since you immigrated, you have to learn to integrate into the local society.