What are the procedures for China people to return to China after emigrating to other countries?

Now that you have emigrated, it depends on whether you are a foreigner or not. Or does China have permanent residency?

If you are a foreign citizen, after applying for a passport in China, you must apply for a tourist visa at the China Embassy.

Go back to China as a foreigner. However, China's detention time is limited.

If you have a permanent green card, you can go straight back to China.