In　this　study,　a　numerical　model　for　the　seawater-sediment-bedrock　system　is　proposed　to　evaluate　the　seismic　responses　of　ocean　sites　under　obliquely　incident　P-SV　wsaves.　First,　the　stiffness　matrix　method　for　the　soil　medium　with　an　arbitrary　angle　input　of　seismic　waves　is　extended　to　evaluate　the　seismic　responses　of　the　seawater-sediment-bedrock　system.　The　wave　radiation　effects　of　the　far-field　domain　are　fully　considered　by　the　exact　artificial　boundary　conditions.　Second,　the　proposed　model　is　verified　by　degenerated　models　and　a　nu-merical　model　developed　by　the　authors,　which　are　inapplicable　to　arbitrary-angle　inputs　of　seismic　waves.　Third,　the　effects　of　site　properties,　including　the　porosity　and　permeability　of　the　seabed,　incident　angle　and　depth　of　seawater,　on　the　peak　response　of　the　sediment　layer　under　obliquely　incident　P　and　SV　waves　are　analysed.　The　results　are　conducive　to　understanding　the　seismic　responses　of　ocean　sites.