For mining machine hydraulic system high traditional quantitative pump common problems such as low efficiency and easy to damage, system of quantitative pump system and load sensitive variable pump were analyzed in theory, based on the analysis of two kinds of adjustable hydraulic system of high efficiency, the simulation of the two higher hydraulic system was carried out, the results showed that the load sensitive variable pump system since there was no overflow loss, the quantitative pump raised system efficiency was higher, the load sensitive variable pump system can more adapt to the working condition of coal winning machine.