1, the demand of subway operation and development: With the increase of subway lines and passenger flow, the workload of subway security personnel will also increase accordingly, and more people are needed to ensure the safety of the subway.

2. Requirements for each post in the subway station: The security inspector is only one post in the subway station, and there are other posts that also need personnel, such as station attendants, ticket sellers and drivers. With the increase of passenger flow, the work pressure of these positions will also increase, and more people are needed to deal with it.

3. Security inspectors work in shifts: Because the subway operation time is 24 hours, security inspectors need to be on duty in turns, and the working hours are not fixed, which brings certain difficulties to recruitment. In addition, the number of security personnel will be adjusted due to different passenger flows at different time periods, so it is necessary to constantly recruit new employees to fill the vacancy.

4. High working pressure and poor working environment: subway security personnel need to bear great working pressure, including security inspection and emergency treatment. Working in a noisy, unventilated and crowded environment for a long time will also bring certain psychological and physical pressure to employees, resulting in a high turnover rate.

5. Reserve talents: In order to cope with possible emergencies or large-scale passenger flow in the future, MTRC will reserve some talents in advance in case of emergency. These talents need to pass training and assessment to be competent for their jobs, so they also need to constantly recruit new employees.