This　paper　presents　a　semi-analytical　method　(SAM)　to　predict　accurately　the　ultimate　capacity　of　a　rectangular　concrete-filled　tubular　(RCFT)　column　subjected　to　eccentric　compression.　In　this　method,　the　analytical　equations　are　established　based　on　all　the　possible　stress　states　of　the　section.　Specifically,　each　equation　set　contains　the　equilibrium　equations,　extremum　equations,　curvature-deflection　equation　and　stress-curvature　equation.　The　predicted　ultimate　load　is　solved　by　numerical　solution　of　equation　sets.　The　proposed　approach　chose　an　accurate　piecewise-nonlinear　constitutive　model　for　confined　concrete　considering　beneficial　confinement　effect　of　rectangular　steel　tube.　The　pre-existing　relevant　tests　and　finite　element　method　(FEM)　were　compared　with　the　proposed　SAM　to　verify　the　accuracy　and　applicability　of　predicted　ultimate　loads　by　SAM,　and　parameters　analyses　for　aspect　ratio,　steel　strength,　depth-to-thickness　ratio　and　length-to-depth　ratios　were　studied　by　proposed　SAM　to　determine　these　effects　onN-Minteraction　curve　of　RCFT　columns.　The　comparison　indicates　that　the　proposed　SAM　is　accurate　in　predicting　the　ultimate　loads　of　RCFT　columns　under　eccentric　compression.