To　investigate　the　torsion-bending　ratio　effect　on　the　SRC　column　stress　and　deformation　under　combined　bending　and　torsion　action,　the　torsion-bending　ratio　was　selected　as　the　main　control　parameter　and　quasi-static　tests　of　7　steel　reinforced　concrete　(SRC)　columns　under　proportional　bending　and　torsion　loading　were　conducted.　It　was　studied　for　the　torsion-bending　ratio　effect　on　the　failure　characteristics,　hysteretic　behavior,　bearing　capacity　and　deformation　characteristics　of　the　SRC　columns,　and　it　was　also　established　for　the　SRC　column　bending,　torsional　bearing　capacity　and　deformation　calculation　methods　under　the　combined　action　of　bending　and　torsion.　The　results　show　that　the　torsion-bending　ratio　is　the　main　parameter　affecting　the　aseismic　performance　as　well　as　determines　the　failure　type　of　the　SRC　columns.　Both　bending　and　torsional　bearing　capacity　are　reduced　under　combined　bending　and　torsion　loadings,　but　the　torsion-bending　ratio　effects　on　the　bending　and　torsion　are　opposite.　Comparing　with　the　constant　torque　tests,　the　interaction　between　bending　and　torsional　bearing　capacity　decreases　under　both　proportional　bending　and　torsion　quasi-static　tests,　and　the　results　are　more　conservative.　©　2018,　Engineering　Mechanics　Press.　All　right　reserved.