The working environment of the axial piston pump is harsh and the working conditions are complex,and the piston moves in a reciprocating linear in the piston cavity,bearing complex alternating stresses.Fatigue damage is one of its common failure forms.In order to analyze the fatigue damage of the piston pump and predict its remaining life to improve its safety and reliability,the fatigue damage analysis and life prediction method of the piston pump was proposed.The rigid-soft-liquid coupling model of the piston pump was established,and the joint simulation and analysis were carried out;based on the Miner fatigue cumulative damage theory,the fatigue damage cloud map and fatigue life cloud map of the piston were obtained by using ANSYS Workbench software and nCode module,and the weak parts of the fatigue damage of the piston pump and the remaining life were analyzed;finally,the effects of spindle speed,working pressure on fatigue damage and remaining life of the piston pump were explored. The results show that under typical working conditions,the fatigue life of the piston is about 7 448.8 h,which can basically meet the fatigue life requirements of the piston.