In order to analyze the kinematics characteristics of the swashplate axial piston pump’s piston shoes, the kinematics model of the piston shoes is established. The law of different block pore diameter distribution of swashplate angle in axial motion along the surface of swash plate was analyzed. The design principle were given of the piston shoes neck round hole diameter and its distribution circle diameter. The analysis result and the method have settled a foundation for further optimum design and count of the longevity.