This　paper　presents　the　results　of　axial　compression　tests　of　steel-reinforced　concrete-filled　square　steel　tubular　(SRCFSST)　stub　columns　after　exposure　to　elevated　temperature.　A　total　of　135　SRCFSST　specimens　are　designed　and　tested,　including　27　specimens　that　are　unheated　and　108　that　are　heated　for　different　times.　Each　test　examines　the　effects　of　concrete　strength,　width-to-thickness　ratio　of　the　square　steel　tube,　section　steel　ratio　and　heating　times　on　the　strength,　deformation　and　ductility　characteristics　of　the　specimen.　Test　results　indicate　that　the　section　steel　ratio　has　the　greatest　effect　on　the　post-yield　behavior　of　the　SRCFSST　stub　columns.　On　the　other　hand,　temperature　has　the　greatest　effect　on　the　residual　bearing　capacity　of　the　SRCFSST　stub　columns.　The　section　steel　ratio　has　the　second　greatest　effect　on　the　residual　bearing　capacity,　followed　by　the　concrete　strength　grade　and　the　width-thickness　ratio　of　the　steel　tube.　Equations　are　proposed　to　predict　the　ultimate　strength　of　the　composite　columns　at　room　temperature　and　after　exposure　to　elevated　temperature.　The　computed　values　from　the　formulae　are　consistent　with　the　experimental　results.