The　concrete　filled　steel　tubular　(CFST)　structure　has　wide　application　prospects　in　construction　of　railway　arch　bridges　and　piers.　Four　different　loading　methods　of　the　CFST　structure　used　in　real　engineering　projects　are　presented,　which　are　loading　on　the　full　section,　on　only　core　concrete　and　on　only　steel,　and　the　steel　tube　having　initial　stresses.　Experimental　research　on　influence　of　different　loading　methods　to　behaviors　of　CFST　stub　columns　subjected　to　axial　loads　is　carried　out.　Analyses　results　indicate　that　for　the　specimens　subjected　to　loading　on　the　full　section,　on　only　core　concrete,　and　on　the　steel　first　and　then　on　the　full　section　(with　an　initial　stress),　the　ultimate　load　carrying　capacities　are　similar　but　the　hooping　effect　and　stiffness　are　different　to　some　extent.　For　the　specimens　under　a　load　acted　only　on　the　steel　tube　throughout　the　whole　process,　the　ultimate　load　carrying　capacity　and　stiffness　decreases　obviously,　the　hooping　effect　of　outer　steel　on　core　concrete　can　be　neglected.　Lastly,　the　estimating　method　of　the　ultimate　load　carrying　capacity　for　CFST　stub　columns　under　four　axial　loading　methods　are　analyzed　and　discussed.