What should I do if my passport for returning to China is cancelled two years later and the Immigration Bureau says that I can't do it because of alleged fraud?

Go to the local immigration office for relevant information.

The immigration bureau said that if your passport involves illegal information, you can go to the local public security bureau or the immigration bureau to inquire about relevant information. If you don't do it yourself, you can report it to the local public security bureau immediately.

Passport is a legal document issued by a country to prove the nationality and identity of its citizens when they enter or leave the country, travel abroad or live.