This paper provided a new whole design method about the overall system from the structural design of magnetic bearings to control system design, based on practical applications in industry. It proposed two parameters—x (circumference of each pole/( circumference of each pole + circumference of each groove)) and y(radial thickness of each groove/ circumference of each groove), which play a decisive role in the structural design, and it made a thorough research about them. It also gave the formula of PID controller using the stiffness and damping, the final analysis of a power loss and heat checking. This prototype installed in a grinder ran well and its precision can reach 1μm.