Do I need a visa to return to China with an American green card?

You don't need a visa to get an American green card back to China, because you are still a citizen of China and your passport is China, so you don't need a visa to enter China.

However, if you become an American citizen, you need a visa to come to China. Because only three countries in the world can stay in China for two weeks without a visa, they are: Japan, Brunei and Singapore. In other words, other countries need visas to enter China.

If you sign a tourist visa, you can stay for 3 months. After 3 months, you can enter China with another visa after leaving China, so you can stay for another 3 months.

Having American identity here should actually mean becoming an American citizen and holding an American passport, so that you can buy air tickets directly to many countries in the world without a visa.

You can only apply for American citizenship if you have a green card for more than 5 years, so that you can change your passport into an American passport. Only in this way can you become a real American citizen. These five years are generally called "immigration supervision". In these five years, you must really live in the United States for more than 30 months before you can apply for American citizenship. If you leave the country for more than one year, this period should be counted from the date of returning to the United States.

So, in other words, you can go back to China, but you can't go back to China for more than 1 year. If it is more than one year, the time spent in the front does not count. From the day you re-enter the United States, you must accept immigration supervision again.

Moreover, the applicant has lived in the state where the application was submitted for the last six months of five consecutive years, that is, he must live in the state he wants to join in the last six months of these five years. For example, if he wants to apply for naturalization in New York State, he must stay in New York State for the last six months of these five years.

So you are not allowed to leave the United States in the last six months of these five years. You must stay there.