Based on the decreasing of supporting stiffness on account of the sliding of pads and the basic principle of the wheel-rail system dynamics, the vehicle-track-bridge vertical coupling dynamic model is established to calculate and analyze the dynamic performance of the vehicle and the track structure subject to the sliding of pads. The results show that: (1) with the increasing of the sliding of the pads, the vibration acceleration of the vehicle and the track structure, the vertical displacement of the rail and road slab, the maximum wheel-rail force, reduction rate of wheel load are all increasing; and the minimum wheel-rail force decreases; and with the increasing of the sliding of the pads, the change of dynamics indicators of the vehicle and the track structure tends to increase; ( 2 ) based on dynamic parameters of the vehicle and the track structure, the sliding of the pads should not be more than 120 mm.%基于轨下胶垫滑出后扣件支撑刚度减小和轮轨系统动力学基本原理，建立车辆-轨道-桥梁垂向耦合动力学模型，计算分析轨下胶垫滑出对车辆与轨道结构的动力学性能的影响，得出以下结论：(1)随着轨下胶垫滑出量的增加，车辆与轨道结构的振动加速度、钢轨与道床板的垂向位移、最大轮轨力、减载率均有增大趋势；最小轮轨力有减小趋势；且随着轨下胶垫滑出量的增加，车辆以及轨道结构的动力学指标的变化趋势逐渐增大。(2)基于车辆以及轨道结构的动力学指标，轨下胶垫滑出量不宜大于120 mm。
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