A　low　friction　coefficient　and　high　bearing　capacity　can　improve　the　service　life　of　implants　in　the　human　body.　In　this　study,　the　surface　performance　was　improved　by　coupling　the　structure　with　the　material.　The　bionic　structure　was　obtained　on　the　titanium　alloy　(Ti6Al4V)　surface　by　chemical　etching.　The　mechanical　properties　of　Ti6Al4V　with　bionic　structure　were　investigated　by　tribological　experiments　with　different　stresses.　An　interesting　phenomenon　was　found　that　the　friction　coefficient　of　etched　surface　decreased　with　the　increase　of　the　stress,　indicating　that　bionic　structure　can　effectively　improve　the　stability　of　Ti6Al4V　surface　bearing　capacity.　A　poly　(vinylsulfonic　acid)　sodium　(PVSNa)　coating　was　further　fabricated　on　etched　Ti6Al4V　to　obtain　low　friction.　During　the　sliding　process,　PVSNA　molecules　were　continuously　added　from　the　bionic　structure　to　the　surface　through　friction　force　for　lubrication.　The　synergistic　regulation　of　bionic　structure　and　PVSNa　coating　made　Ti6Al4V　surface　obtain　low　friction　and　high　bearing　capacity　stability.　This　study　can　serve　as　a　guide　for　the　design　of　low　friction　and　high　bearing　capacity　stability.　©　Published　under　licence　by　IOP　Publishing　Ltd.