This article content including the DC motor, the DC motor driving circuit and the microcomputer controller as well as the vehicles steering wheel organization, the attempt use DC motor's characteristic, simulates the vehicles to go on the different path changes, on the vehicles steering wheel reflected the moment variation. Using the vehicles dynamics, we may simulates because of vehicles' characteristic parameter and the vehicles drive condition, the vehicles travel on the different path, the vehicles steering wheel should respond how many moment variation. In this article, we can change microcomputer controller vehicles' characteristic parameter and vehicles drive condition, easier simulation different vehicles go the vehicles steering wheel moment variation which in different road surfaces.