The　behavior　of　very　slender　concrete　filled　tubular　columns　and　hollow　tubular　columns　with　circular　sections　subjected　to　axial　load　was　investigated　experimentally.　A　total　of　fifteen　specimens　including　eleven　concrete　filled　steel　tubular　columns　and　four　hollow　tubular　columns　were　studied.　The　main　objectives　of　these　tests　were　twofold:　first,　to　describe　a　series　of　tests　on　very　slender　composite　columns;　and　secondly,　to　compare　the　accuracy　of　the　predictions　by　using　the　recommendations　of　LRFD,　AIJ,　EC4　and　DL/T　5085.　Experimental　results　indicate　that　the　concrete　infill　increases　the　compressive　load　capacity　of　the　steel　tube.　The　loading　capacity　of　the　concrete　filled　steel　tubular　columns　can　be　conservatively　predicted　by　using　LRFD,　AIJ,　EC4　and　DL/T　5085　recommendations　for　normal　length　columns.