To solve the problems of serious energy consumption and low electromotor running efficiency of beam pumping unit, a new structural scheme of hybrid power beam pumping unit was proposed. In this scheme, the mechanicalhydraulic torque coupling transmission mechanism was adopted, the energy storage and release was realized through the hydraulic system. The output power of the motor was stable and the operation efficiency was high.The mathematical model and energy loss model of the system were established, and the principle verification experiment platform was established.The effectiveness of the energy regulation of the mechanicalhydraulic system was verified through comparing experiment and simulation.The design method of the system parameters was put forward,and the lost power of the pumping unit was obtained under different hydraulic system combination structures by studying the system parameters.The study results show that the energy loss can be minimized by using variable pumpvariable motor combination scheme