Generally, the city bureaus of prefecture-level cities are all middle-level, and the directors are also middle-level. Public security is special. General city public security bureau chief will be assigned to the deputy mayor, even before the politics and law committee secretary. Therefore, the director of the Municipal Public Security Bureau is generally the CPC. Generally, there is a first deputy director at the level, and other deputy directors are normal CPC. If it is a deputy ministerial-level city such as Guangzhou and Shenzhen, the director or deputy mayor is concurrently appointed, and the level is the main hall level. In the same way, the directors of provincial public security departments/municipalities directly under the central government, and vice governors/mayors are all deputy ministerial level.

The director of the public security bureau of an ordinary prefecture-level city (director level) is generally the deputy mayor (deputy director level). Bureau-level deputy: for example, the deputy director of a Ministry, the deputy director of a provincial department, the deputy provincial and municipal authorities, the full-time leaders of the four teams under their jurisdiction (such as the director of Harbin Finance Bureau and the director of Nanjing Gulou District People's Congress), the deputy leaders of the four teams in prefecture-level cities, and so on. If the director of the Municipal Public Security Bureau concurrently serves as the deputy mayor, the level is equivalent, otherwise it will be half a level lower.

The duties of public security organs are: (1) to prevent, stop and investigate illegal and criminal activities. (2) Maintaining public order and stopping acts endangering public order. (3) Maintaining traffic safety and traffic order and handling traffic accidents. (four) to organize the implementation of fire control work, the implementation of fire supervision. (five) the management of firearms, ammunition, controlled knives and inflammable, explosive, toxic and radioactive dangerous goods. (six) the management of special industries as stipulated by laws and regulations. (seven) to guard the specific personnel specified by the state and guard the important places and facilities. (eight) the management of assemblies, processions and demonstrations. (nine) the management of housework, nationality, entry and exit affairs and foreigners' residence and travel in China. (ten) to maintain public order in the country (border). (eleven) the execution of criminal penalties for criminals sentenced to criminal detention or deprivation of political rights. (twelve) to supervise and manage the security protection of computer information systems. (thirteen) to guide and supervise the public security work of state organs, social organizations, enterprises and institutions and key construction projects, and to guide the public security prevention work of public security committees and other mass organizations. (fourteen) other duties as prescribed by laws and regulations.