Abstract: The aim of the research is to realize the robust design of priority valve. Based on the analytical method and SIMULINK software, the dynamic mathematical model and simulation model of priority valve were established, and the influence characteristics of system parameters on priority valve dynamic response were analyzed. On basis of analyzing the main influencing factors on dynamic response, the robust design based on loss model was completed, by using the minimum overshoot of priority steering system flow response as the design objective, the valve core diameter, spring stiffness and throttle area as the design variables, the steering wheel angular, steering load, work load and output flow as the uncertain factors. The results show that robust design can improve design objective to a certain extent, the dynamic response characteristic of priority valve is promoted. The design method is also applicable to other valves design improvement.