In　order　to　investigate　the　influence　of　stiffeners　on　the　seismic　performance　of　circular　concrete-filled　steel　tube　(CFST)　columns,　low-cycle　reversed　loading　tests　of　five　circular　CFST　columns　with　stiffeners　were　conducted.　The　main　parameters　covered　the　shear　span　to　depth　ratio　and　the　arrangement　of　stiffeners.　The　shear　span　to　depth　ratios　were　3.0　and　2.2,　and　the　cross-sections　were　set　as　steel　tube,　steel　tube　with　welded　circumferential　stiffeners,　and　steel　tube　with　both　welded　circumferential　and　vertical　stiffeners.　The　failure　characteristics,　hysteresis　behavior,　bearing　capacity,　ductility,　stiffness　degradation,　and　energy　dissipation　capacity　of　each　specimen　were　analyzed.　The　test　results　show　that　the　addition　of　the　circumferential　stiffeners　can　improve　the　flexural　bearing　capacity　and　ductility　of　the　specimen,　and　the　circumferential　stiffeners　have　a　significant　effect　on　enhancing　the　local　stability　of　the　steel　tubes　and　limitting　the　buckling.　Setting　both　the　circumferential　and　vertical　stiffeners　can　further　improve　the　flexural　bearing　capacity　and　ductility.　By　reducing　the　shear　span　to　depth　ratio,　the　initial　stiffness　can　be　significantly　improved,　but　the　stiffness　degradation　rate　is　faster,　and　the　cumulative　damage　effect　is　more　significant.　The　calculated　values　under　the　combined　effect　of　compression,　bending,　and　shearing　based　on　the　formula　of　the　CFST　column　bearing　capacity　according　to　DBJ/T　13-51-2010　are　lower　than　the　test　results,　showing　the　code　formula　is　safer.　A　nonlinear　finite　element　(FE)　model　was　carried　out　using　ABAQUS,　and　the　comparison　shows　that　the　FE　analysis　results　are　in　good　agreement　with　the　test　results.　Based　on　this　FE　model,　the　parametric　analysis　was　conducted.　The　effect　of　vertical　ribs　on　the　bearing　capacity　of　circular　CFST　column　is　higher　than　that　of　the　circular　ribs.　Increasing　the　thickness　of　steel　tube　and　improving　yield　strength　of　steel　tube　can　improve　the　bearing　capacity　and　ductility.　Increasing　the　compression　strength　of　concrete　can　not　significantly　improve　the　bearing　capacity,　and　the　ductility　becomes　worse.　©　2021,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.