In order to improve vehicle steering performance, Multi-axle dynamic steering technology is put forward. Because of simple and low cost, the mechanical dynamic steering mechanism is suitable for heavy vehicle. In order to design ideal steering mechanism, the principle of dynamic steering mechanism was analyzed. Based on theories of multi-axle dynamic steering and vehicle dynamic, the steering angle relationships of different axles were analyzed. Taken a vehicle as an example, the corresponding steering mechanism was designed. Full vehicle model was established and handling stability performance was simulated. The results show that the mechanical dynamic steering vehicle can effectively improve vehicle agility performance at low speed and stability at high speed.