What do the police stations in Changchun mainly do?

You'd better consult the police station or public security bureau that recruits security guards. Only they know what kind of job they are applying for. Working time arrangement.

Generally speaking, the police assist the police. For example, here, if they assist the police in handling cases, they usually drive, guard suspects, cooperate with arrests and so on. If it is to assist the community police, it is to cooperate with the police to visit. If you know computers, then the police will come and you will enter the system, just like a civilian.

If it is a public welfare post, it will not be very hard, but generally speaking, the salary is relatively low.