For analyzing the ride comfort performance,a dynamical model of an IVECO vehicle was built in this paper.The simulation study of the IVECO vehicle suspension performance on random uneven road is carried out by means of the dynamical model.The effects of suspension system parameters on the vehicle ride comfort parameter,i.e.,the root mean square(RMS)of the vibrating acceleration of the vehicle body,are analyzed.The optimal parameters and initial value of the suspension system can be determined by the model and the method of this paper. For analyzing the ride comfort performance, a dynamical model of an IVECO vehicle was built in this paper. The simulation study of the IVECO vehicle suspension performance on random road is carried out by means of the dynamical model. The effects of suspension system parameters on the vehicle ride comfort parameter, ie, the root mean square (RMS) of the vibrating acceleration of the vehicle body, is analyzed. optimal value and initial value of the suspension system can be determined by the model and the method of this paper.