What are the ways for foreigners to become China citizens or apply for green cards?

Nationality Law of the People's Republic of China

Article 7 Foreigners or stateless persons who are willing to abide by the Constitution and laws of China and meet one of the following conditions may apply for naturalization as citizens of China:

First, close relatives of China people;

Second, settle in China;

3. There are other legitimate reasons.

Article 8 Those who apply for China citizenship and are approved will acquire China citizenship; Those who have been approved to join China nationality shall not retain their foreign nationality.

Article 15 The organs accepting nationality applications are local municipal and county public security bureaus at home, and China's diplomatic representative offices and consular offices abroad.

Article 16 Applications for joining, quitting and restoring China nationality shall be examined and approved by People's Republic of China (PRC) and the Ministry of Public Security. If approved, the Ministry of Public Security will issue a certificate.