An　experimental　study　on　nine　stub　columns　under　axial　compression　is　carried　out.　The　effects　of　the　hollow　ratio　and　diameter　to　thickness　ratio　on　axial　compressive　behavior　of　concrete-filled　double　skin　thin-walled　steel　tubular　(CFDSTST)　stub　columns　with　an　outer　square　tube　and　an　inner　circular　tube　are　studied.　The　test　results　indicate　that　CFDSTST　stub　columns　have　many　advantages　such　as　good　ductility　and　high　strength.　The　numerical　simulation　of　CFDSTST　stub　columns　under　axial　compression　is　then　carried　out.　The　predicted　results　agree　well　with　the　test　data.　The　mechanical　analysis　indicates　that　the　confining　effect　on　concrete　is　focused　on　the　corner　of　the　steel　tube,　and　the　longitudinal　stiffeners　can　effectively　enhance　the　load　bearing　capacity　of　the　square　steel　tube.　However,　the　parameter　analysis　indicates　that　with　the　increase　of　yield　strength　of　steel　tubes,　concrete　strength　or　diameter　to　thickness　ratio,　the　load　bearing　capacities　increase.　Also,　a　higher　hollow　ratio　leads　to　higher　ductility.　Finally,　a　simplified　calculation　equation　is　proposed　to　predict　the　axial　compressive　resistance　of　CFDSTST　stub　columns.　©　2018,　Progress　in　Steel　Buiding　Structures　All　right　reserved.