To　meet　the　requirements　of　practical　engineering,　mega　steel-reinforced　concrete　(SRC)　columns　have　been　used　in　super　high-rise　buildings　in　recent　years.　Previous　studies　on　SRC　columns　primarily　focused　on　simple　H-shaped　and　cruciform　steel　sections;　insufficient　attention　was　paid　to　mega　columns,　which　are　frequently　designed　with　complex　steel　sections　and　high-strength　concrete.　In　this　study,　four　1/6　scaled　mega　steel-reinforced　high-strength　concrete　(SRHC)　rectangular　columns　with　cross-sectional　dimensions　of　700　mm　x　565　mm　and　various　steel　ratios　and　concrete　strengths　were　tested　under　one-way　repeated　compression　to　examine　the　damage　evolution,　load-axial　deformation　response,　axial　bearing　capacity,　ductility,　stiffness　degradation,　strain　development,　restoration,　and　energy　dissipation　capacity.　The　test　results　indicated　that　increasing　the　steel　ratio　effectively　alleviated　crack　widening　and　concrete　spalling　and　advanced　the　bearing　capacity,　ductility,　stiffness,　restoration,　and　energy　dissipation　capacity.　With　an　increase　in　concrete　strength,　the　peak　load,　stiffness,　restoration　capacity　in　the　elastic-plastic　stage,　and　the　energy　dissipation　capacity　in　the　elastic　stage　improved,　whereas　the　ductility　was　sharply　impaired,　resulting　in　more　abrupt　damage.　Three　provisions　were　examined　to　calculate　the　bearing　capacity　with　conservative　estimation.　Hence,　a　theoretical　model　considering　the　confinement　from　the　stirrups　and　steel　sections　was　presented　to　predict　the　axial　strength　with　a　desirable　accuracy.　Furthermore,　a　finite　element　model　was　developed　to　perform　the　damage　evolution　and　parametric　study.