The　piston　pump　is　a　core　power　component　of　aviation　hydraulic　servo　control　systems,　and　its　performance　directly　affects　the　overall　efficacy　of　the　hydraulic　system.　A　significant　challenge　affecting　the　stability　and　control　of　hydraulic　servo　systems　is　the　flow　pulsation　generated　by　the　axial　piston　pump.　This　flow　pulsation　primarily　arises　from　pressure　fluctuations　during　the　piston　flow　distribution　process.　To　address　this　issue,　a　pre-compression　chamber　structure　has　been　designed　to　achieve　pre-boost　and　pre-depressurization　of　the　piston,　thereby　enhancing　the　performance　of　the　piston　pump.　Computational　fluid　dynamics　(CFD)　methods　are　employed　to　analyze　the　flow　characteristics　of　the　piston　pump.　Simulation　results　indicate　that　the　pre-compression　volume　effectively　pre-pressurizes　the　piston　chamber,　reducing　the　pressure　differential　between　the　piston　chamber　and　the　high-pressure　outlet.　This　modification　results　in　a　reduction　of　approximately　12.3%　in　outlet　flow　pulsation　for　the　bidirectional　piston　pump.　This　study　provides　a　foundational　approach　for　achieving　stable　flow　output　in　piston　pumps.　©　The　Institution　of　Engineering　&　Technology　2024.