With a U.S. green card, how long can I stay in China?

Although I have a U.S. green card, my nationality is still Chinese, so I am free to take them back to my country for as long as I want. However, in order to maintain the validity of the U.S. green card, you must enter the United States at least once every six months, that is, you can return to the country and stay for up to six consecutive months. Otherwise, the U.S. Immigration Service will doubt whether you really want to become a permanent resident of the United States. However, if there are special circumstances that prevent you from returning to the United States once a year, you can apply for a re-entry permit (valid for 1-2 years) from the US Citizenship and Immigration Service, so that you can return to the United States after one year. Of course, if you want to enter and leave the United States multiple times within a year, there will be no problem.

The U.S. green card generally refers to the U.S. permanent resident card.

The United States Permanent Resident Card, also known as the green card, is an identity document used to prove that foreigners have permanent resident status in the United States. "Obtaining a green card" is used to refer to the immigration process of becoming a permanent resident. Lawful permanent residence for green card holders is an official grant of immigration benefits, including conditional permission to remain and work in the United States. The holder must maintain his or her permanent resident status and may lose it if one of the conditions required for the status is no longer met.