Existing　studies　have　shown　that　the　seismic　performance　of　the　mortise　and　grouting　sleeve　mixed　connection　assembled　square　pier　(referred　to　as　the　mixed　connection　assembled　pier)　is　close　to　that　of　the　integral　cast-in-place　pier.　In　order　to　further　explore　the　axial　compression　performance　of　the　mixed-connected　bridge　piers,　a　series　of　axial　compressive　tests　were　conducted　on　one　integral　cast-in-place　bridge　pier　(No.　ZT)　and　four　mixed　connection　and　assembled　bridge　piers　(No.　GTA-0~GTD-0)　with　varying　parameters　such　as　the　length,　diameter　and　wall　thickness　of　the　steel　pipes.　The　results　show　that　the　bearing　capacity　of　GTA-0~GTD-0　specimens　increased　by　10.1%　to　14.4%　compared　to　the　ZT　specimens,　and　their　ductility　coefficients　were　all　greater　than　that　of　ZT　specimens.　The　axial　compression　bearing　capacity　of　GTA-0~GTD-0　specimens　increased　with　the　diameter　and　length　of　the　steel　pipe,　while　the　wall　thickness　of　the　steel　pipe　had　a　relatively　minor　impact　on　the　bearing　capacity.　The　damage　position　of　the　assembled　bridge　pier　moves　upward　with　the　increase　of　the　steel　pipe　length,　gradually　approaching　the　integral　cast-in-place　bridge　pier,　but　the　failure　modes　of　the　two　are　basically　the　same.　©　2024　Chongqing　University.　All　rights　reserved.