The　strength　and　flexural　stiffness　of　CFST　columns　will　decrease　significantly　after　exposure　to　fire.　In　order　to　ensure　its　seismic　performance,　it　is　necessary　to　repair　the　damaged　columns.　In　this　paper,　the　cyclic　static　test　has　been　carried　out　for　concrete-filled　square　hollow　section　(SHS)　columns　strengthened　by　concrete-filled　steel　tubes　after　exposure　to　fire.　Based　on　the　experiment,　the　structure　performance　of　columns　are　compared　and　analyzed.　The　test　results　indicate　that　strengthening　using　concrete-filled　steel　tubes　is　an　extremely　effective　method　and　that　the　strength　and　flexural　stiffness　of　the　repaired　columns　can　be　restored　to　its　previous　condition.