Tianjin has a big secretary. Tianjin book secretary is because. Tianjin is a municipality directly under the central government, and the administrative level of the secretary of the municipal party committee is ministerial level. Chongqing, referred to as "Mountain City" and "Jiangcheng City" for short, is a provincial administrative region, municipality directly under the Central Government, national central city and megacity in People's Republic of China (PRC), and one of the important national central cities approved by the State Council.