Mechanical drive reciprocating plunger pump is widely used in oil field, due to the Limited (crank crank radius limited), only the short stroke and high stroke work, this work led to the deterioration of performance, the pump suction valve box fatigue cracking, the suction valve and discharge valve of the working life is short, high flow pulsation etc. a series of problems, people have to take a number of measures to improve the pump's working condition. For example, the installation of suction, discharge pulsation damper to improve the suction performance of the pump, reduce the flow pulsation; improve the material and improve the heat treatment process to extend the valve box and valve service life, etc.. In addition, the current operation of some of the operating requirements of the working medium in the pumping process of low shear, less disturbance, in this case, the short stroke, high stroke mechanical reciprocating pump appears powerless. Hydraulic drive plunger pump is easy to achieve long stroke, low impact mode of work, simple structure, high degree of standardization, and convenient flow adjustment.