Circular　concrete-filled　steel　tube　(CFST)　columns,　which　are　widely　used　in　high-rise　and　super　high-rise　buildings,　have　good　mechanical　performance.　Low-cyclic　loading　tests　were　conducted　on　eight　large-sized　specimens　with　different　shear-to-span　ratios　to　investigate　the　seismic　performance　of　circular　CFST　stub　columns　with　different　inner　constructions　(an　internal　circular　steel　tube,　built-in　partitions,　vertical　stiffeners,　circumferential　stiffeners,　and　a　built-in　reinforcement　cage).　The　results　show　that　built-in　partitions　coordinated　the　common　deformation　of　the　internal　and　external　steel　tubes,　providing　the　specimen　with　the　best　seismic　performance.　By　setting　an　internal　circular　steel　tube　in　circular　CFST　stub　columns,　a　significant　confining　effect　on　the　core　concrete　was　generated　and　the　deformation　of　the　external　steel　tube　was　well　developed,　which　significantly　improved　the　seismic　performance　of　the　specimens.　Setting　circumferential　stiffeners　had　a　significant　confining　effect　on　the　radial　deformation　of　the　steel　tube,　and　placing　vertical　stiffeners　between　the　circumferential　stiffeners　had　an　obvious　effect　on　preventing　local　buckling　and　improving　the　flexural　capacity　of　the　steel　tube.　The　energy　dissipation　capacity　of　the　specimens　with　different　inner　constructions　was　better　when　the　shear-to-span　ratio　was　smaller.　A　method　for　calculating　the　peak　bearing　capacity　of　such　circular　CFST　stub　columns　is　proposed,　which　can　accurately　predict　the　peak　bearing　capacity　of　the　columns　and　provide　a　basis　for　the　calculation　of　their　application　in　practical　engineering.