Mainly to prevent, stop and punish all kinds of criminal activities within the jurisdiction of the railway or related to the railway. For example, all cases that constitute criminal punishment on the train or train station and in units, colleges, hotels and restaurants where real estate belongs to the railway department, such as embezzlement, wounding, provocation, poisoning, explosion, arson, etc., will be accepted and investigated.

Under normal circumstances, the subordinates of the criminal police detachment are: criminal investigation brigade (responsible for accepting general criminal cases and investigations); Plainclothes brigade (responsible for preventing and seizing current cases); Major case brigade (responsible for detecting major cases) and case trial brigade (responsible for reviewing and closing cases).