The　fire　behavior　of　concrete-filled　double　skin　(CHS　inner　and　CHS　outer)　steel　tubular　columns　during　exposing　to　the　ISO-834　or　GB/T　9978-1999　standard　fire　has　been　investigated　and　the　results　presented　in　this　paper.　Based　on　the　theoretical　model,　influence　of　the　changing　parameters　on　the　fire　resistance　and　the　residual　strength　index　of　the　composite　columns　under　fire　are　discussed.　It　was　found,　in　general,　that　the　sectional　dimension,　the　slenderness　ratio　and　the　fire　protection　thickness　have　significant　influence　on　the　fire　resistance　of　the　composite　columns,　and　the　sectional　dimension,　the　slenderness　ratio,　the　hollow　ratio　and　the　fire　exposure　time　have　significant　influence　on　the　residual　strength　index,　however,　the　material　strength,　the　nominal　steel　ratio,　the　thickness　of　inner　tube　and　the　load　eccentricity　ratio　have　moderate　influence　on　the　fire　resistance　and　the　residual　strength　index.　The　results　in　this　paper　may　be　referenced　for　practical　engineering.