The computer simulation on stochastic road irregularities is performed based on the sinusoid superposition method. The procedure for deriving the stochastic road irregularities is given with the application of space frequency domain road model. The stochastic road irregularities are generated by the program coded by Matlab software. Finally, the stochastic road irregularities are carried out by exporting it to the virtual prototype technique software ADAMS for evaluating the performance of vehicles. It is shown from the results that the process for analyzing and evaluating the characteristics of vehicles becomes more convenient with the application of the generated stochastic road irregularities.