This model is applied to drilling machine, concrete machinery, hydraulic industrial equipment and all kinds of hydraulic open-circuit equipment. It has the characteristics of high power density, strong self-priming ability, long life and low noise and so on. Through shaft swash plate type variable axial piston pump, and the mainly controlling methods are including: positive flow control, negative flow control, constant power control, pressure cut-off control and load sensitive control and other control modes . Through shaft swash plate type variable axial piston pump, and the mainly controlling methods are including: positive flow control, negative flow control, constant power control, pressure cut-off control and load sensitive control and other control modes . It has the characteristics of high power density, strong self-absorption ability, long life and low noise and so on.