Square　composite-sectional　concrete-filled　stainless　steel　tubular　(CFSST)　column　is　a　new　type　of　composite　member　and　has　the　potential　for　wide　applications.In　order　to　investigate　the　hysteretic　behavior　of　the　columns,　eight　beam-column　specimens　were　tested　under　cyclic　loading.The　main　parameters　were　axial　load　ratio　(0.05,　0.3　and　0.6),　dimension　ratio　of　inner　tube　to　outer　tube　(0.42　and　0.67),　types　of　columns　(composite-sectional　CFSST,　double-skin　hollow-interior　CFSST　and　CFSST).A　finite　element　model　was　developed　to　analyze　the　hysteretic　behavior　of　the　square　composite-sectional　CFSST　column.The　influences　of　parameters　on　lateral　load-displacement　skeleton　curves　were　investigated.The　results　show　that,　the　hysteretic　curves　of　square　composite-sectional　CFSST　columns　are　relatively　plump.The　columns　have　higher　bearing　capacity,　ductility　and　plastic　energy　dissipation　capacity　than　the　double-skin　hollow-interior　CFSST　and　CFSST　columns.The　bearing　capacity　of　the　square　composite-sectional　CFSST　column　increases　dramatically　with　increasing　yield　strength　of　outer　tube　and　sandwich　concrete　compressive　strength　or　decreasing　width-to-thickness　ratio　of　outer　tube,　axial　load　ratio　and　slenderness　ratio.The　bearing　capacity　increases　gently　with　increasing　dimension　ratio　of　inner　tube　to　outer　tube　or　decreasing　width-to-thickness　ratio　of　inner　tube.In　most　cases,　the　bearing　capacity　of　square　composite-sectional　CFSST　can　be　increased　by　2%~20%　compared　to　that　of　the　composite-sectional　conventional　concrete-filled　steel　tube.　©　2019,　Editorial　Office　of　China　Civil　Engineering　Journal.　All　right　reserved.