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Hydrostatic transmission with secondary regulation is a new kind of hydrostatic transmission, which can regenerate inertial and gravitational energy of load. Based on deeply analyzing the working principles and energy-saving theory of bus secondary regulating transmission system, regenerating the transmission system's inertial energy by controlling constant torque was put forward. Considering large changes of the parameters of the transmission system and its non-linearity, a fuzzy control was adopted to control the hybrid vehicle, and the mathematical model of the system was established, then the simulations of the performance of the transmission system has been conducted. The conclusion was made that the inertial energy can be reclaimed and reused in the system by the application of the secondary regulation technology, and braking by controlling constant torque is stable, it can ensure the security and comfort of braking at high speed and also permits changing the efficiency of recovery by changing the braking torque. The system's power has been reduced and energy saving has been achieved.