In view of the problem of large flow and pressure shock caused by the distribution conversion of the asymmetric axial piston pump with three-distribution window in the non-dead transition zone,a novel valve plate structure was proposed,in which extra oil passages was used to pre-drain the high-pressure oil from the non-dead transition area to the top dead transition area.By using this method,flow pulsations and pressure shocks were reduced.Moreover,the high pressure oil in the non-dead transition zone was reused,which could improve the energy efficiency of the hydraulic pump.A new type of distribution plate structure was designed and the working principle of the new distribution plate was analyzed from the theoretical point of view.Next,the simulation model of the asymmetric axial piston pump based on the new distribution plate was established.The influences of oil channel radius and distribution position on flow pulsation of axial piston pump were analyzed.The effectiveness of the new valve plate structure under different load conditions was researched.The results show that using this scheme,pre-reducing the pressure of the non-dead-point transition zone plunger and pre-increasing the pressure of the upper dead-point transition zone plunger can be realized;when the oil hole radius is 0.65 mm and the distribution position is 8° and 88°,the axial piston pump has the best performance.