This　paper　presented　axial　compression　tests　on　the　behavior　of　the　circular　concrete　filled　steel　tube　stub　columns　with　double　inner　square　steel　tubes　(DIS-CFST).　A　total　of　27　DIS-CFST　stub　columns　with　different　eccentricity　ratio　(e),　hollow　area　ratio　(psi)　and　concrete　compressive　strength　(C)　were　tested.　The　study　mainly　investigated　the　failure　modes,　ultimate　bearing　capacity,　load-strain　curves,　load-displacement　curves,　initial　stiffness　at　elastic　stage　(k(i))　and　ductility　of　the　DIS-CFST　stub　column.　The　failure　mode　of　DIS-CFST　stub　columns　observed　from　the　tests　was　local　buckling　and　no　crack　was　observed　on　the　surface　of　the　specimens.　It　was　found　that　concrete　compressive　strength　had　remarkable　influence　on　ductility　and　ultimate　bearing　capacity　of　DIS-CFST　stub　columns.　However,　eccentricity　ratio　had　little　influence　on　the　behavior　of　DIS-CFST　stub　columns.　Experimental　results　showed　that　when　the　hollow　ratio　was　small,　it　had　little　effect　on　the　ultimate　load-carrying　capacity　of　DIS-CFST　stub　columns.　However,　the　ultimate　bearing　capacity　of　specimens　significantly　decreased　when　hollow　area　ratio　was　large.　The　eccentricity　ratio,　hollow　area　ratio　and　the　concrete　compressive　strength　had　slight　influence　on　initial　stiffness　at　elastic　stage.　Furthermore,　the　ductility　of　DIS-CFST　stub　columns　increased　with　the　decrease　of　hollow　area　ratio.　A　simplified　formula　was　proposed　to　calculate　the　ultimate　bearing　capacity　of　DIS-CFST　stub　columns.　The　predicted　ultimate　bearing　capacities　were　in　good　agreement　with　DIS-CFST　stub　column　test　results.　By　comparing　with　the　existing　strength　calculation　formula,　it　can　be　concluded　that　the　ACI　code,　EC4　and　Han＇s　method　were　more　satisfied　with　the　requirements　of　the　design.