To study the influence of self-excited vibration on the curve squeal noise in the wheel/rail contact,the dynamical equation for 1-DOF wheel/rail lateral contact system is derived.A new friction coefficient model based on De Beer model is adopted to calculate the friction force in the wheel/rail contact surface.The influence of kinetic and static friction coefficients as well as the lateral creepage on the stability of self-excited vibration system is investigated.The calculation results show that wheel’s inherent modes will be excited by the unstable self-excited vibration.If the structural damping of wheel/rail contact system is larger than the equivalent damping of the friction force,or the value of lateral creepage is less than 0.0024,the self-excited vibration system will be stable,and thus the curve squeal noise can be restrained.