In　order　to　study　the　differences　in　loading　behavior　of　specially-shaped　multi-cell　concrete-filled　steel　tubular　columns　(CFST)　loaded　along　different　directions,　five　1/30　scaled　CFST　specimens　were　designed.　The　specimens　have　two　types　of　cross-section:　13-cell　type　(basic)　and　5-cell　type　(simplified).　Basic-type　specimens　were　loaded　along　long　axis,　short　axis　and　45°directions,　respectively,　while　simplified-type　specimens　were　loaded　along　long　axis　and　short　axis.　Failure　patterns,　hysteretic　characteristics,　bearing　capacity,　stiffness　degradation,　ductility　and　energy-dissipating　capacity　were　analyzed　through　quasi-static　test.　The　results　show　that　the　average　yielding　drift　ratio　and　damage　drift　ratio　of　specimens　are　1/92　and　1/30,　respectively,　demonstrating　good　ductility　of　CFST.　The　bearing　capacity　of　basic-type　specimens　decreases　while　their　ductility　improves　with　loading　directions　changing　from　long　axis　to　short　axis.　Significant　differences　in　behavior　can　be　observed　when　specimens　were　loaded　along　different　directions.　Though　the　bearing　capacity　of　simplified-type　specimens　is　lower　than　that　of　basic-type　specimens,　their　ductility　is　better　and　their　behavior　doesn＇t　have　significant　differences　when　loaded　along　different　directions.　Numerical　simulation　results　by　ABAQUS　show　good　agreement　with　experimental　results　including　stiffness,　yielding　load,　yielding　displacement,　peak　load　and　peak　displacement.　The　influence　of　reinforcement　cage,　axial　compression　ratio　and　concrete　strength　on　the　behavior　of　specially-shaped　CFST　were　analyzed.　Analysis　results　show　that　the　reinforcement　cage　can　improve　the　bearing　capacity　which　increases　with　the　increasing　of　concrete　strength;　on　the　other　hand,　the　bearing　capacity　and　ductility　decrease　with　the　increasing　of　axial　compression　ratio.　©　2019,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.