Seawater　axial　piston　pump　(SWAPP)　has　been　widely　used　as　the　power　component　in　the　seawater　reverse　osmosis　(SWRO)　desalination　systems,　whose　flow　quality　could　result　in　significant　influences　on　the　performance　of　RO　membranes　and　SWRO　system.　This　thesis　proposed　an　efficient　fully　parameterized　mathematical　approach　for　the　flow　and　pressure　characteristics　of　SWAPP　that　is　modeled　by　lumped　parameter　techniques　considering　gaseous　and　vaporous　cavitation　simultaneously.　To　address　the　complex　structure　of　the　port　plate　in　SWAPP,　especially　silencing　groove,　an　innovative　model　based　on　the　Monte　Carlo　method　was　originally　proposed,　and　In-depth　comparison　with　piecewise　functions　validated　the　accuracy,　efficient　and　convenient　of　Monte　Carlo　approach　for　calculating　the　flow　area　of　SWAPP.　Particularly,　the　influence　of　shaft　rotational　speed　and　inlet　pressure　on　the　instantaneous　discharge　flow　and　pressure　of　SWAPP　was　comparatively　studied.　In　addition,　a　SWRO　desalination　system　was　constructed　to　evaluate　the　effect　of　discharge　pressure　of　SWAPP　on　the　RO　concentrated　brine　pressure.　The　results　indicate　that　the　presented　model　can　precisely　capture　the　instantaneous　discharge　pressure　and　flow　of　SWAPP.　Besides,　increasing　the　shaft　rotational　speed　and　inlet　pressure　are　reliable　solutions　to　enhance　the　flow　performance　of　SWRO　system.　©　2022　Elsevier　B.V.