A certain aircraft carrier hydraulic pressure arresting system was studied. As the main arresting forcing producing components, the mathematical models of the hydraulic block system and pulley buffer system were established according to the basic theory of hydraulic transmission system. Using these two models, combining the dynamic models of the arresting cable and the aircraft-s landing process, a series of numerical simulations were carried out under different aircraft weight and landing velocity. The simulation value was compared with trial value and the difference was studied. The result showed that the pulley buffer system can reduce the tension of the arresting cable effectively and that the change of the control valve can realize the arresting of aircrafts with different weight within around 100��m, which also verified the rationality of the model.