Can you immigrate back after emigration?

If you have a green card, just go back to China directly, and you don't need to apply for immigration with anyone.

If you are just a citizen and don't have a green card, you have to go through the formalities of renouncing American citizenship before you can return to China. The process is quite troublesome.

Legal basis: Article 9 of the Law of People's Republic of China (PRC) on Exit and Entry Administration. China citizens shall apply for passports or other travel documents when leaving or entering the country.

China citizens who want to go to other countries or regions also need to obtain visas or other entry permits. However, unless the China government has signed visa exemption agreements with other governments or the Ministry of Public Security and the Ministry of Foreign Affairs provide otherwise.

China citizens who leave or enter the country as seafarers and work on foreign ships shall apply for a seaman's certificate according to law.