Conventional beam pumping units have occupied an important position in oilfield equipment due to such characteristics as simple structure, high reliability, simple operation, easy maintenance, and so on. In fact, there are about 90,000 sets of beam pumping units in China. However, the unbalanced structure of the beam pumping units cannot be entirely eliminated because of the inherent geometry and mechanical properties of four-bar linkage, that is the electromotor equivalent torque ripple cannot be absorbed or eliminated by counterweight in up-and-down travels, which causes the electromotor to work under greatly changed load rate with low power factor and high energy consumption. The mechanical relationship of a conventional beam pumping unit was derived first, and then parameters of a basic structure were optimized through dynamic optimization. On this basis, the hydraulic hybrid solution was proposed, and a secondary balance was conducted on the optimal pumping unit electrometer’s load torque. Computer simulation model was established to carry out a system dynamic analysis and the results showed that the scheme can reduce the motor load torque ripple, improve motor load rate and power factor, and reduce motor power effectively. It may bring tremendous decrease of electricity cost and have great significance for oilfield equipment energy saving, oil extraction cost reduction, and promotion of petroleum products’ competitiveness.