The Air Traffic Management Bureau of the General Administration of Civil Aviation of China (ATMB of CAAC) is a functional agency of CAAC to administer the national air traffic services, civil aviation communication,navigation, surveillance, aeronautical meteorology and navigation information.Corresponding functional departments, comprehensive departments and subordinated technical support units have been set up directly under ATMB, with a total of 300 people. Its main duties are: establishment of air management system and long-term development plans and annual projects; Establishment of trade rules, standards and norms; management of scientific research, personnel training and licensing; organization, implementation, and supervision of the daily operation of aircrafts and flight testing;To take charge of handling international affairs of air traffic management system. The existing air traffic management system of CAAC is a 3-layer management system, namely the ATMB of CAAC, the regional air traffic management bureau and the air management center; The basic organization form is a 3-layer air traffic service system which consists of regional management, approach management and airport management, with a total of 12,000 people.