Aiming at speed ratio’s lag, tracking deviation and pulleys’ slipping and over clamping during clamping force control of CVT (continuously variable transmission) hydraulic system, corresponding optimal design methods are employed based on the practical structure of speed ratio control and clamping force control system, and the speed ratio control and clamping force control are employed by the optimal design of the system’s structural parameters. Combine with vehicle’s start-up working condition, simulation analysis is carried out on the platform of AMESim. The analysis results show that the dynamic characteristics and precision of tracking deviation are improved by the optimal design system.