The vehicle is simplified as a three dimension vibrating model with thirteen-freedoms. The road is supposed as an Euler Beam on the Kelvin base and divided with beam elements. Based on the force equilibri- um between the road and the tire, the vibrating model of a vehicle-road coupling system considering the trans- verse displacement of the vehicle is presented. Taking the road irregularities as system self-excitation source and a seismic action as an external excitation, the dynamic functions of the vehicle-road coupled system are derived under vertical and transverse earthquake. The functions are solved with the New-mark method. The results show that: the dynamic response of the vehicle-road coupling system depends on the seismic intensity under the model of this paper, seismic intensity will make the vehicle~ safety and riding comfort to decline sig- nificantly, the transverse seismic intensity has a significant impact on the transverse dynamic response of a ve- hicle and the influence on the vertical vibration of a vehicle can be ignorant, and the vertical seismic intensity has a major impact on the vertical vibration of a vehicle and road. However, the influence of the vertical seis- mic intensity on the transverse acceleration of a vehicle is so important that the impact of vertical seismic inten- sity on judging the safety of a vehicle must be considered.%车辆采用13自由度三维全车模型，路面采用Kelvin地基上Euler梁单位进行离散，通过路面与轮胎接触点的平衡，建立起可以考虑车辆侧向滑动的车路耦合振动模型．将路面初始不平顺视为系统的竖向自激激励源，地震作为外部激励，建立起竖向和横向地震荷载共同作用下车路耦合方程，采用New—mark积分法对耦合方程组进行求解．数值分析结果表明，分析模型下，车路耦合系统的动力响应取决于地震荷载，而地震荷栽作用会使车辆的行驶安全性和乘坐舒适性明显下降；横向地震荷载对车辆和路面的横向振动有显著影响，对车辆的竖向振动可忽略；竖向地震荷载对车辆和路面的竖向振动影响较大，对车体的横向振动有一定程度的影响，以至于在评判车辆运行安全性时必须考虑其影响．
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