According to the transmission principle of hydraulic mechanical continuously variable transmission(CVT), combined with HMCVT test bench, pump control motor measurement & control system and HMCVT measurement & control system, the working efficiency of bidirectional variable pump was analyzed. Multivariate regression model was established by using Design Expert 10, and the influence of various factors on the efficiency of bidirectional variable pump was analyzed by using the response surface method. In order to improve the working efficiency of the variable pump controlled quantitative motor system, the fuzzy control model and the dynamic model were established by using MATLAB/Simulink and multibody dynamics software ITI SimulationX, and joint simulation was conducted. The output speed of the motor and the displacement ratio of the bidirectional variable pump were compared by using adaptive fuzzy PID control method and ordinary PID control method. The results show that the stable output speed time of the quantitative motor decreases by 0.86 s, the overshoot decreases by 11.4%; the displacement ratio decreases by 0.57 s compared with the stable output time, and the overshoot decreases by 15.5%.The experimental results provide a basis for further study on the efficiency and dynamic characteristics of HMCVT