Intelligent control is widely applied in complex systems because of its good control effect. Fuzzy control, as one of the intelligent control, does not depend on the accurate mathematical models of the controlled plant and is suitable to deal with nonlinear and uncertainty systems. Sliding mode control has the characteristics of insensitivity to parameter variations and external disturbance. Integrating fuzzy control and sliding mode control for the application in the secondary controlled hydrostatic transmission system can effectively resolve the influence of nonlinear, parameter variations and disturbance, and enables the system to have good dynamic quality. To improve the system efficiency, the secondary controlled hydrostatic transmission system with two secondary units driving one load was designed, and the mathematical model of the system was deduced. Then, the fuzzy controller and sliding mode controller of the control system were designed. On this basis, the whole system was simulated in MATLAB/Simulink. The results indicate that the application of fuzzy sliding mode control enables the system to respond quickly and be not subject to the influence of parameter variations of controlled plant, and good control effect is achieved.