China citizens with American green cards work in China.

American green cards are not overseas Chinese. This means that you are still a citizen of China, but you have the right to live in the United States. After living in the United States for five years, you can apply for naturalization and become an overseas Chinese. The green card has little effect on your life and work in China, because you are still from China, but you should pay attention to living in the United States for a period of time every year after you get the green card. If you stay in China for a long time, your green card will be revoked, so it is useful to want to go to the United States, but it is useless to want to go.