In this thesis, a new type of steering system is designed that the stepping motor links the worm gear reducer and drives the wheel to steer. Considering the requirements of the car, chooses the suitable suspension and calculate the main parameters, the resistance from the steering and the parameters of the motor. Design a Fault-Response- System, so the vehicle can guarantee the basic steering function when some of the steering motors don't work. Build the model of suspension and steering system in CATIA and simply simulate in ADAMS.