If I have China nationality, can I apply for another nationality?

No, China nationality is not allowed to have a second nationality.

Our government does not recognize dual nationality. China government stipulates that China citizens who choose to become foreign nationals must cancel their household registration in China. That is to say, if a representative becomes a foreign national, he will give up his China nationality.

Under normal circumstances, as long as the person goes to China from a foreign country, he does not use a foreign passport, but uses a China passport, that is, he tries to conceal the fact of joining a foreign nationality. But this kind of thing won't last long, because before you become a foreign nationality, you usually get a foreign permanent residence visa, commonly called a green card, which is valid for five years. During the period of obtaining the green card, as long as you live in that country for a period of time, you can have the right to join that country's nationality, and after joining the nationality, your permanent residence visa will actually expire.