To　investigate　the　influence　of　reinforcement　cages　and　circular　steel　tube　on　special-shaped　multi-cell　concrete-filled　steel　tube　(SMCFST)　under　reciprocating　axial　load,　three　large-size　specimens　were　designed　based　on　Z15　tower.　The　failure　model,　load-deformation　curves,　skeleton　curves,　bearing　capacity,　deformation　capacity,　stiffness　degeneration,　cumulative　energy　dissipation,　and　strain　of　the　specimens　were　analyzed.　Codes　of　different　nations　were　utilized　to　calculate　the　bearing　capacity　of　the　specimens.　The　results　shown　that　the　reinforcement　cages　could　enhance　the　initial　stiffness　and　bearing　capacity　of　the　specimens.　The　circular　steel　tube　could　further　improve　the　initial　stiffness　and　bearing　capacity,　as　well　as　significantly　enhance　the　ductility,　cumulative　energy　dissipation,　and　the　behavior　of　the　specimens　at　the　later　stage.　Moreover,　since　the　codes　ignored　the　effect　of　horizontal　diaphragms　and　the　different　buckling　mechanisms　between　inner　steel　plate　and　outer　steel　plate,　the　calculation　results　were　significantly　lower　than　the　experimental　results.　Therefore,　it　was　necessary　to　further　investigate　the　calculation　method　of　the　multi-cell　concrete-filled　steel　tube.　The　circular　steel　tube　was　suggested　to　be　used　in　buildings　to　improve　the　axial　compression　behavior　of　the　special-shaped　multi-cell　concrete-filled　steel　tube.　©　2019,　Editorial　Board　of　Journal　of　Harbin　Institute　of　Technology.　All　right　reserved.