With　the　increasing　use　of　concrete-filled　steel　tubes　(CFST)　as　structural　members,　there　is　a　growing　need　to　provide　suitable　measures　for　possible　strengthening　or　repair　of　these　kinds　of　structural　elements.　Fibre　reinforced　polymer　(FRP)　jacketing　is　a　recent　method　and　is　particularly　attractive　in　which　it　does　not　significantly　increase　the　section　size,　and　is　relatively　easy　to　install.　Thus,　it　can　be　used　to　enhance　strength　and/or　ductility　of　CFST　members.　Very　little　information　is　available　on　the　performance　of　FRP-strengthened　CFST　members　under　fire　conditions.　This　paper　is　an　attempt　to　study　the　fire　performance　of　CFST　columns　strengthened　by　FRP.　The　results　of　fire　endurance　tests　on　FRP-strengthened　circular　CFST　columns　are　presented.　Failure　modes　of　the　specimens　after　exposure　to　fire,　temperatures　in　the　cross　section,　axial　deformation　and　fire　resistance　of　the　composite　columns　are　analysed.　It　is　demonstrated　that　the　required　fire　endurance　can　be　achieved　if　the　strengthened　composite　columns　are　appropriately　designed.