In　this　paper,　the　axial　compressive　behavior　of　circular　steel-reinforced　concrete-filled　stainless　steel　tubular　(SRCFSST)　stub　columns　was　experimentally　investigated　and　modeled　by　finite　element　(FE)　simulations.　Six　specimens　were　developed　and　tested,　with　concrete　strength　and　steel　section　ratio　as　the　test　variables.　The　resulting　failure　pattern,　load-displacement　curve,　bearing　capacity,　ductility,　the　residual　bearing　capacity　index,　rigidity,　strength-to-weight-ratio,　and　strain　characteristics　were　analyzed.　FE　models　were　established　to　validate　the　experimental　results.　More　extended　FE　simulations　were　carried　out　considering　steel　tube　strength,　steel　tube　wall　thickness,　and　concrete　strength　as　variables.　The　results　show　that　the　circular　SRCFSST　stub　column　has　high　bearing　capacity　and　residual　bearing　capacity.　The　inserted　steel　section　blocks　the　extension　of　concrete　diagonal　cracks.　The　resulting　load-displacement　curve　showed　elastic,　elastic-plastic,　plastic,　and　maintenance　stages.　Inserting　the　steel　section　improved　the　specimen　ductility.　The　residual　bearing　capacity　index　(Ld)　indicates　that　using　inserted　steel　sections　and　lower-strength　concrete　can　effectively　enhance　the　residual　bearing　capacity.　The　numerical　simulation　and　experimental　results　are　in　good　agreement.　Finally,　theoretical　analysis　based　on　EC4,　GB50936-2014,　and　models　presented　in　the　literature　was　conducted,　and　a　simplified　equation　to　evaluate　the　axial　ultimate　compressive　strength　of　circular　SRCFSST　stub　columns　was　proposed,　which　exhibited　good　agreement　with　experimental　and　numerical　findings.