Through the long-term tracking test of the EMU line,it is found that the abnormal wheel flange wear of the EMU on a line is the main reason for the scrapping of the wheelset.The wheel flange wear of three commonly used EMUs was tracked and measured,and the wheel flange wear rules were contrasted and analyzed.In order to explore the influence of suspension parameters which have great influence on vehicle dynamics performance on wheel flange wear,the dynamics simulation model of EMUs was established by using SIMPACK,and the vehicle dynamic performance parameters under different suspension parameters were calculated.The dynamic indexes under different suspension parameters were discussed.According to the stress condition of two-point contact,the influence of dynamic performance parameters on wheel flange wear was analyzed,and the influence of the change of suspension parameters on the vehicle’s straight running performance was verified.The simulation results indicate that the positioning stiffness of the axle box is responsible for the wheel/rail angle of attack and lateral force on the tight curve,which is the capital factor affecting the wheel flange wear.