Recycled　aggregate　concrete　(RAC)　is　an　environmentally　friendly　building　material.　This　paper　investigates　the　mechanical　behavior　of　recycled　aggregate　concrete　filled　steel　tube　(RACFST)　columns　exposed　to　fire.　Two　groups　of　12　columns　were　designed　and　tested,　under　axial　compression,　before　and　after　fire,　to　evaluate　the　degradation　of　bearing　capacity　due　to　fire　exposure.　Six　specimens　were　subjected　to　axial　compression　tests　at　room　temperature　and　the　other　six　specimens　were　subjected　to　axial　compression　tests　after　a　fire　exposure.　The　main　parameters　of　the　specimens　include　the　wall　thickness　of　the　steel　tube　(steel　content)　and　the　type　of　concrete　materials.　Several　parameters　as　obtained　from　the　experimental　results　were　compared　and　analyzed,　including　the　load-bearing　capacity,　deformation　capacity,　and　failure　characteristics　of　the　specimens.　Meanwhile,　rate　of　loss　of　bearing　capacity　of　specimens　exposed　to　fire　were　calculated　based　on　the　standards　EC4　and　CECS28:90.　The　results　show　that　concrete　material　has　a　large　influence　on　the　rate　of　loss　of　bearing　capacity　in　the　case　of　a　relatively　lower　steel　ratio.　While　steel　content　has　little　effect　on　the　rate　of　loss　of　bearing　capacity　of　concrete-filled　steel　tube　(CFST)　columns　after　fire,　it　has　a　relatively　large　influence　on　the　loss　rate　of　bearing　capacity　of　the　RACFST　columns.　The　loss　of　bearing　capacity　of　the　specimens　from　the　experiment　is　more　serious　than　that　from　the　calculation.　As　the　calculated　values　are　less　conservative,　particular　attention　should　be　given　to　the　application　of　recycled　aggregate　concrete　in　actual　structures.