Legal basis: People's Republic of China (PRC) Law on Guarding State Secrets.
Article 2 State secrets refer to matters that are determined in accordance with legal procedures and are known only to a certain range of people within a certain period of time and are related to national security and interests.
Article 10 State secrets are classified into three levels: top secret, confidential and secret. Top secret state secrets are the most important state secrets, the disclosure of which will cause particularly serious damage to national security and interests; Confidential state secrets are important state secrets, the disclosure of which will cause serious damage to national security and interests; Secret-level state secrets are general state secrets, the disclosure of which will harm national security and interests.