In
China, a
public security bureau (
PSB) refers to a government office essentially acting as a
police station or a local or provincial
police; the smallest police stations are called police posts . The PSB system is similar in concept to the Japanese
Koban system, and is present in each province and municipality. Typically, a PSB handles policing,
public security, and
social order, the other duties of such offices include residence registration ("
hukou"), as well as internal and external
migration matters, such as the registration of temporary residents (including both foreign and domestic visitors).