Aiming at the asymmetric flow problem of pump-controlled differential cylinder,the asymmetric distribution principle of axial piston pump with three distribution windows was studied,and a new distribution plate structure was designed based on this principle by using the residual compression force.The performance of the pump was studied by combining PumpLinx simulation and experimental verification,and the influence of the transition zone structure on the pressure and flow characteristics of the piston pump was analyzed.The basic characteristics of the pump such as pressure,flow and noise under different working conditions were tested on the test bench,and the rationality of the new structure was verified.The new flow distribution scheme can not only compensate the flow difference of the differential cylinder,but also output two different pressure flow,by which the ideal effect of direct control of the differential cylinder by the hydraulic pump is achieved.