Test　results　of　six　concrete-filled　double-skin　steel　tubular　(CFDST)　stub　columns　are　presented　in　this　paper.　Circular　hollow　section　(CHS)　and　square　hollow　section　(SHS)　were　used　to　fabricate　the　inner　and　outer　skins　of　the　composite　columns.　The　main　parameters　explored　in　this　test　programme　were　the　section　type　(CHS　inner　and　CHS　outer,　SHS　inner　and　SHS　outer,　CHS　inner　and　SHS　outer)　and　whether　or　not　exposure　to　fire.　It　was　found　that　the　strength　of　the　CFDST　columns　decreased　significantly　after　exposure　to　fire.　However,　the　residual　strength　of　these　innovative　columns　was　still　comparable　to　that　of　conventional　concrete-filled　steel　tubular　columns.　Of　all　the　three　types　of　sections　with　a　same　hollow　section　ratio,　the　one　with　CHS　inner　and　SHS　outer　shown　the　highest　residual　strength.