Abstract: This paper describes a high-speed, high-accuracy digital servo-system composed of self-developed MCS-96 Series Single chip computer and PWM driver. The author suggested several methods, such as "Fuzzy rough or accurate regulating Control", "e and é nonlinear quantizing method", and explained the physical meaning of every constant in the state table. Using these methods, experiments show that the system has very high tracking accuracy and good stationary character. Under step-input, the system has a fast transient process and a very small overshoot.