The bottom structure of the slipper in axial piston pump directly influences oil film performance of the slipper pair.In order to seek a kind of slipper structure for the high pressure axial piston pump of 35MPa, the regulating principle of oil film pressure of the slipper pair was analyzed, and the influences of three slippers with different bottom structures on oil film performance were investigated respectively by means of FLUENT module of ANSYS software, including the slippers with bottom structure of inner auxiliary supporting surface (called one-ring structure) and bottom structure of inner and outer auxiliary supporting surface (called two-ring structure, including two ring connected structure and two-ring disconnected structure).The results show that the slipper of two-ring connected structure has the worst comprehensive performances, while the slipper of two-ring disconnected structure has the best comprehensive performances, and it is recommended as the slipper for developing the high pressure axial piston pump of 35MPa.But, for the two-ring disconnected structure, the outer auxiliary supporting surface belongs to high temperature region, and the slope groove between the seal belt and edge results in big pressure drop, so the structure needs to be further optimized.