Experimental　research　on　influence　of　four　types　of　loading　methods　on　behaviors　of　CFST　long　columns　and　mid-long　columns　subjected　to　axial　loads　is　carried　out.　The　comparison　between　stubs　and　long　columns　is　presented.　Analyses　results　indicate　that　the　loading　methods　influence　the　cross-section　stresses　of　long　columns　slightly　and　the　stiffness　and　stability　limit　load-carrying　capacity　significantly.　The　effects　of　initial　stresses　on　load-carrying　capacity　of　long　columns　are　serious　than　for　short　columns.　When　loading　is　applied　only　on　steel　tubes,　the　load-carrying　capacity　of　the　long　columns　is　larger　than　that　of　the　short　columns.　With　the　increasing　of　the　slenderness　ratio,　the　influence　of　the　loading　method　on　the　hooping　effect　and　mechanical　behavior　of　the　members　are　decreased.　The　influence　of　the　loading　method　on　mid-long　columns　lies　between　long　columns　and　stub　columns,　and　it　appears　more　close　to　latter　ones.　Finally,　the　estimating　method　of　the　load-carrying　capacity　of　CFST　long　and　mid-long　columns　under　different　modes　of　axial　loading　is　discussed.