With the 750 mL/r axial piston pump as the research object,the wear,copper adhesion and damage of the key components under 35 MPa high-pressure and 1 600 r/min high-speed were analyzed.By optimizing the structural parameters of key components,improving the hardness and surface roughness of structural components,delivery test and type test were carried out according to industry standards.Comparing to the test results before optimization,the optimized key performance such as spillage characteristics and friction & wear characteristics were significantly improved,which confirmed the effectiveness of the optimization scheme.