0～10 Hz和10～20 Hz。The low speed vehicle has been selected as prototype and analysis has been done with the theory of vehicle vibration, because in the condition of good roads and empty loads at the speed of about 40 km/h, this truck vibrated distinctly. Then three different kinds of vehicle vibrating models were established. According to the truck’s road test and modal test, and the theory of vehicle vibration, the simulation of these three models was made, and the results were analyzed. It proved the results of simulation well agreed with the experiment. The frame should be considered as elastic. The frequency for the single particle rigid frame is 0～10 Hz and 10～20 Hz for the multi-particle elastic frame. 