In order to find a way to restrain the cavitation of hydraulic components from the structure,the influence of the axial piston pump cylinder kidney shape hole structure on the self suction of the plunger cavity is theoretically analyzed,and the plunger cavity cavitation is simulated by using the Fluent software.Then,based on the princi- ple of the Kriging interpolation,an agent model is constructed by taking the structure parameters of the cylinder kidney shape hole as the independent variable and the gas volume fraction of the plunger cavity as the objective function value.Moreover,the constructed agent model is optimized by using the cross breeding particle swarm al- gorithm,thus obtaining the optimized structure of the cylinder kidney shape hole,which provides a new method to overcome the strong coupling relationship between the structure parameters of the axial piston pump.According to the above analysis,the structure and parameters of the cylinder kidney shape hole and the valve plate groove of the axial piston pump,which can maximize the inhibition of the plunger cavity cavitation,are obtained.Simulation re- sults demonstrate that the obtained structure can significantly inhibit the plunger cavity cavitation.