An　innovative　square　steel　tube　confined　rubberized　concrete　column　is　proposed　in　this　study　to　alleviate　the　pollution　from　waste　rubber　and　improve　the　mechanical　properties　of　conventional　concrete.　The　axial　compressive　behavior　of　square　steel　tube　confined　rubberized　concrete　(RuSTCC)　stub　column　is　experimentally　studied.　A　total　of　thirty-two　specimens,　including　four　square　steel　tube　confined　concrete　(STCC)　stub　columns　and　twenty-eight　Ru-STCC　stub　columns,　were　fabricated　and　tested.　The　variables　included　rubber　particle　volume　replacement　ratio,　steel　tube　thickness,　rubber　particle　size　and　concrete　strength　grade.　The　failure　mode,　axial　ultimate　compressive　strength,　rigidity,　ductility,　strain　characteristics,　and　confinement　effects　were　analyzed.　The　results　show　that　the　failure　modes　of　Ru-STCC　specimens　were　the　core　concrete　shear　failure　and　steel　tube　buckling.　Ultimate　axial　compressive　strength　and　rigidity　were　found　inversely　proportional　to　the　volume　replacement　ratio,　When　the　volume　replacement　ratio　reached　20%,　the　ultimate　axial　compressive　strength　and　rigidity　reduced　by　more　than　20%.　With　the　increase　of　steel　tube　thickness,　the　ultimate　axial　compressive　strength　increased　by　more　than　10%.　Concrete　strength　grade　and　rubber　particle　size　have　significant　effects　on　rigidity　and　ductility,　respectively.　In　addition,　the　differences　between　square　concrete-filled　in　steel　tube　(CFST),　rubberized　concrete-filled　in　steel　tube　(Ru-CFST),　STCC,　and　Ru-STCC　stub　columns　were　discussed　by　compressive　strength　and　deformation　capacity.　The　axial　ultimate　compressive　strength　of　square　Ru-STCC　specimens　was　evaluated　using　various　calculation　models.　The　simplified　formulae　for　the　prediction　of　axial　ultimate　compressive　strength　were　also　presented.