A hydraulic power unit consisting of a pneumatic booster pump, unlike conventional hydraulic power unit is operated by an electric motor or a hydraulic pump. Existing power units were mainly produced in the category of 46% efficiency. In order to produce high efficiency of the power unit (90%) of the installed add a variable piston pump and a load sensing device, but a method of electronic control of the electro-proportional control valve as Lab View program, for a lot of the cost generally did not common. Hydraulic power unit composed of the booster pump has a characteristic that is output to a 90% efficiency to the characteristics of the pneumatic booster. Thus, the low cost and ease of installation even more by 90% effective universal hydraulic power unit out.