Anti-slip device is a kind of parking anti-slip device used in arrival and departure lines, intermediate stations, special lines, loading lines and locomotive depot incoming and outgoing lines. With the development of railway technology, the automation and intelligence level of anti-slip system have been continuously improved, and it has gradually become one of the main means of parking and anti-slip. The dynamic response characteristic of TFY-YH anti-slip system is studied, the finite element simulation model of anti-slip system is constructed, the displacement of piston rod, the time of piston rod in place, the speed of piston rod and the change of oil pressure of accumulator in the process of braking and relieving of anti-slip system are systematically studied, the pressure holding performance of anti-slip system is analyzed, and the method to improve the pressure holding ability is put forward, and the relationship between the stop position of train and the time of braking and relieving in place is obtained, and a method to locate the stop position of train is proposed, which lays a certain theoretical foundation for intelligent control and monitoring of anti-slip system.