Hard-to-hard　material　combination　have　potential　application　to　solve　the　abrasive　wear　problem　in　seawater　hydraulic　components.　To　select　suitable　material　combination　for　key　tribopairs　in　seawater　hydraulic　components,　the　tribological　performance　of　TiCN-based　cermet,　Tungsten　carbide　(WC)　with　6%wt　of　Co　(YG6X)　and　WC　with　6%wt　of　Ni　(YN6X)　against　Si3N4　ceramic　in　seawater　was　experimentally　investigated.　The　results　show　that　the　coefficients　of　friction　and　wear　of　the　YN6X/Si3N4　tribopair　were　below　those　of　other　tribopairs.　The　Ni　in　YN6X　could　effectively　reduce　the　corrosion　effect　of　seawater.　The　ploughing　effect　caused　by　the　peeling　of　the　adhesion　layer　on　the　Si3N4　increased　the　rate　of　wear　of　TiCN.　And　the　corrosive　impact　of　the　seawater　exacerbated　the　ploughing　effect,　resulting　in　heavy　wear　of　the　YG6X.　Therefore,　a　YN6X/Si3N4　tribopair　with　excellent　wear　resistance　has　the　potential　to　prohibit　abrasive　wear　caused　by　seawater.　The　research　can　provide　the　experimental　evidence　for　materials　screening　of　key　tribopairs　in　seawater　hydraulic　components.