To　improve　the　energy　absorption　performance　of　metal　circular　tube　composite　cladding,　foam　concrete　filled　aluminum　tube　composite　cladding　was　proposed　in　the　present　study.　With　consideration　of　different　foam　concrete　densities　of　300　kg/m3,　700　kg/m3　and　1　100　kg/m3,　the　deformation　mode,　mechanical　properties　and　energy　absorption　performance　of　single　foam　concrete　filled　aluminum　tube,　as　well　as　foam　concrete　filled　aluminum　tube　composite　cladding　under　quasi-static　compression,　were　experimentally　investigated.　The　results　show　that　the　energy　absorption　of　the　aluminum　tube　filled　with　300　kg/m3　foam　concrete　is　slightly　inferior　to　that　of　the　hollow　aluminum　tube.　With　increasing　the　foam　concrete　density　to　700　kg/m3　and　1　100　kg/m3,　the　energy　absorption　performance　of　the　filled　aluminum　tube　is　significantly　improved　with　the　increased　total　energy　absorption　by　286%　and　815%,　respectively.　Compared　to　the　single　aluminum　tube,　the　mutual　extrusion　among　tubes　would　greatly　improve　the　specific　energy　absorption　of　the　hollow　aluminum　tube　and　300　kg/m3　foam　concrete　filled　composite　claddings,　which　are　increased　by　28.6%　and　68.9%,　respectively.　Nevertheless,　the　specific　energy　absorptions　of　700　kg/m3　and　1　100　kg/m3　foam　concrete　filled　aluminum　tube　composite　cladding　decrease　by　42.7%　and　38.1%　due　to　the　mutual　extrusion　effect　of　aluminum　tubes.　Therefore,　from　the　point　view　of　the　practical　application　of　the　proposed　foam　concrete　filled　aluminum　tube　composite　cladding,　a　small　aluminum　tube　spacing　is　suggested　with　the　low　density　of　foam　concrete　filler,　meanwhile,　a　large　aluminum　tube　spacing　is　recommended　to　prevent　the　extrusion　of　aluminum　tube　with　the　high　density　of　foam　concrete　filler.　©　2023　Beijing　University　of　Aeronautics　and　Astronautics　(BUAA).　All　rights　reserved.