Based on the viewpoint of self-excited friction vibration of wheel-rail system,the typical phenomenon of rail corrugation at the circular curve section of long ramp of mountainous Metro line was studied.The vehicle-track dynamic model of mountain Metro was established by SIMPACK,which was verified that the creep force between the outer wheel and rail passing through the circular curve section of the long ramp was in a saturated state.The finite element model of leading wheel-rail system composed of wheelset,rail,ballast on the corresponding section was established.The complex eigenvalue analysis method was used to study the stability of wheel-rail system from the perspective of frequency domain.The control variable method was used to study the influence of the vertical stiffness and vertical damping of the isolator in the floating slab structure,and the vertical stiffness and vertical damping of the fastener on the friction self-excited vibration of the wheel-rail system.The results show that the self-excited vibration of wheel-rail friction caused by the saturated creep force between the outer wheel and rail is the main cause of rail corrugation at the outer rail of the long slope curve section,and the induced frequency is 459.63 Hz.Parametric analysis shows that the friction self-excited vibration of wheel-rail system increases with the increase of vertical damping and vertical stiffness of isolator,decreases with the increase of vertical damping of fastener,and decreases first and then increases with the increase of vertical stiffness of fastener.When the vertical support stiffness of fastener is 40 MN/m,rail corrugation is the least likely to occur.