Related catalogues of precursor chemicals include the Catalogue of Classifications and Categories of Precursor Chemicals, the Catalogue of Precursor Chemicals Subject to Import and Export Administration, and partial content of the Catalogue of Dual-Use Items and Technologies Subject to Import License Administration.The supplement of precursor chemicals shall be made based on the announcement of inclusion in the Catalogue of Classifications and Categories of Precursor Chemicals, which means chemicals listed in this Catalogue are precursor chemicals. Moreover, the Ministry of Public Security, with the cooperation of the Ministry of Commerce, the National Health Commission, the Ministry of Emergency Management, the General Administration of Customs, and the National Medical Products Administration, will publish the announcement on supplemented substances irregularly.