Do I need to fill out a form to enter Haikou with an American passport?

Just enter the country directly with your green card and passport. On the plane, you will be asked to fill out an immigration form. When you get off the plane, there will be two queues at the place where you want to enter, in the queue of citizens/permanent residents. Then someone will want to see the green card, passport and that form. Read it. If you have any questions, just answer them truthfully. I don't usually ask any more questions.

The American permanent resident card, also known as the green card, is an identity document used to prove that foreigners have the status of permanent residents in the United States. "Getting a green card" refers to the immigration process of becoming a permanent resident. The legal permanent residency of green card holders is an official immigration benefit, including conditional permission to stay in the United States and get a job. The holder must maintain his permanent resident status, and if he no longer meets certain conditions required by the status, the holder may lose his status.

The benefits of a green card include:

1, enjoy the benefits stipulated by the US government; (For example, every family member can freely enter and leave the United States at any time and live in the United States)

2. Living expenses are cheaper than those in many industrialized countries; For example, children studying in colleges and universities can pay tuition fees like citizens.

3. Students can work legally at school;

4. Enjoy various economic environments, outstanding employment opportunities and superior living standards in the United States;

5. You can enjoy social welfare such as attending public schools, medical security and social life security; You can also invite other family members to the United States through proper application procedures.