To　study　the　axial　compressive　strength　of　the　concrete　filled　composite　steel　tube　short　column　which　is　the　concrete　filled　square　steel　tube　reinforced　with　a　central　circular　steel　tube,　10　specimens　were　tested　under　the　axial　compressive　loading.　Test　results　indicated　that　at　the　peak　axial　load　the　square　steel　tube　had　yielded　in　the　vertical　direction　and　did　not　yield　in　the　lateral　direction;　the　specimens　failed　in　local　buckling　and　tearing　of　square　steel　tube,　crushing　of　concrete　between　the　square　steel　tube　and　the　circular　steel　tube.　For　most　of　the　specimens　even　the　longitudinal　average　strain　reached　0.11,　the　residual　strength　remained　more　than　70%　of　the　peak　compressive　strength.　The　calculated　compressive　stiffness　was　approximately　83.　6%　of　the　measured　values　on　the　average.　Assuming　that　the　steel　tubes　do　not　contribute　lateral　confinement　to　the　concrete,　but　provides　compressive　strength　only,　the　predicted　compressive　strengths　of　the　specimens　has　good　agreement　with　the　test　results.