In order to solve the differences in the state, structure and performance requirements of the working surface and internal of the piston pump friction pair parts, the piston pump friction pair of 38CrMoAlA and ZQSn10-2-3 were treated with different surface processes. The wear condition and surface working condition were analyzed by wear test, and the best surface treatment technology adapted to the friction pair was sought. The results show that the pairing effect of 38CrMoAlA (nitridated) and ZQSn10-2-3 is the best when ZQSn10-2-3 is treated by plasma spraying molybdenum disulfiide solid lubricating film, and there is no adhesion phenomenon.