Multi-cell　concrete-filled　steel　tubular　mega-columns　are　used　in　the　structure　of　China　Zun　Building　in　Beijing.　In　order　to　investigate　the　effect　of　different　cell　details　on　the　axial　compression　performance,　six　1/4　scaled　rectangular　concrete-filled　steel　tubular　column　specimens　with　different　cell　details,　which　were　taken　from　the　bigger　rectangular　cells　at　both　ends　of　the　longitudinal　axis　of　the　mega-column,　were　designed　and　tested　under　repeated　uniaxial　compression　loading.　The　axial　load-displacement　curves,　skeleton　curves,　energy　dissipation,　bearing　capacity,　stiffness　and　strain　of　specimens,　as　well　as　the　effect　on　axial　compression　performance　by　different　cell　construction　details　were　discussed.　Based　on　tests,　the　load　capacity　calculation　method　for　these　columns　was　proposed.　The　results　agree　well　with　the　test.　Finite　element　simulation　was　performed　and　the　results　agree　well　between　finite　element　simulation　and　test.　The　text　result　indicates　that　the　vertical　stiffeners　set　inside　the　cell　help　sharing　axial　force　and　enhancing　the　constraint　of　the　concrete.　The　stiffness,　bearing　capacity　and　ductility　are　strengthened　by　the　vertical　stiffeners.　The　horizontal　tie　bars　help　strengthening　the　constraint　of　the　concrete　after　ultimate　load.　Studs　help　strengthening　cooperative　work　between　steel　tube　and　concrete　after　ultimate　load.　Cooperative　work　between　horizontal　separators　and　steel　tube　helps　strengthening　the　constraint　of　the　concrete.　The　bearing　capacity　and　energy　dissipation　are　enhanced　significantly.　The　steel　bar　cages　further　enhance　the　constraint　of　the　concrete,　slowing　down　the　degeneration　of　mechanical　property.　©　2016,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.