Aiming at the problem of rail corrugation of sharp curved track in mountain metros,the dynamic model of vehicle-track system was established according to the on-site investigation,and the contact characteristics between the wheel and rail of vehicle when passing the sharp curved track was explored.According to the dynamic analysis results,the finite element model of the semi-car body-bogie-track system was established.The complex eigenvalue analysis method was used to study the frictional self-excited vibration characteristics of the semi-car body-bogie-track system,and the vehicle body-bogie-track system was studied.The influence of suspension parameters and track fastener parameters on the frictional self-excited vibration of the overall system was studied.The neural network combined with the genetic algorithm was used to perform multi-parameter fitting on the key parameters affecting the frictional self-excited vibration of the overall system,and the optimal solution of the key parameters of the vehicle/track structure was obtained.The results show that the saturated creep force between the wheel and rail in the sharp curved track section leads to the frictional self-excited vibration of the semi-car body-bogie-track system,thus causing the rail corrugation.The lateral stiffness of the primary suspension in the vehicle structure parameters and the vertical stiffness of the fasteners,the transverse stiffness of the fasteners,and the vertical damping of the fasteners in the track structure parameters have obvious effects on the frictional self-excited vibration of the whole system.When the lateral stiffness of the suspension is 5.34 MN/m,the vertical stiffness of the fastener is 25.45 MN/m,the lateral stiffness of the fastener is 6.9 MN/m,and the vertical damping of the fastener is 6.06 kN·s/m, the rail corrugation on the sharp curved track in the metro can effectively suppressed.