Steel-reinforced　high-strength　concrete　(SRHSC)　columns　can　resist　large　percentages　of　horizontal　shear　forces　and　axial　loads,　and　are　widely　used　in　super　high-rise　buildings.　To　investigate　the　effects　of　the　axial　load　ratio,　steel　ratio,　and　loading　direction　on　the　seismic　performances　of　encased　cross-section　SRHSC　circular　columns,　a　low-cyclic　loading　test　was　conducted　on　four　large-sized　specimens,　each　with　a　diameter　of　700　mm.　The　failure　characteristics,　hysteresis　curves,　bearing　capacity,　deformation,　stiffness　degradation,　and　energy　dissipation　were　analyzed.　The　finite　element　software　OpenSEES　(based　on　fiber　elements)　was　used　to　simulate　the　hysteretic　curves　of　the　test　specimens,　and　the　simulated　results　were　in　good　agreement　with　the　test　results.　The　results　indicate　that　all　four　specimens　show　bending-dominated　damage　characteristics.　The　axial　load　ratio　has　a　significant　influence　on　the　peak　load,　ductility,　and　deformation　capacity.　By　increasing　the　steel　ratio,　the　stiffness　degrades　more　slowly　and　the　specimen　shows　a　better　seismic　energy　dissipation　performance.　The　effect　of　steel　ratio　on　the　improvement　of　peak　load　is　more　evident　under　a　low　axial　load.　With　increasing　steel　strength,　there　is　no　significant　effect　on　the　initial　stiffness　and　ductility.　The　specimens　with　different　loading　directions　have　balanced　seismic　performance,　therefore,　the　columns　are　suitable　for　structures　in　seismic　regions.　There　is　little　difference　between　the　results　calculated　by　the　code　of　China　and　Europe　and　the　test　results,　but　the　results　calculated　by　the　code　of　China　are　in　better　agreement.