Based　on　the　temperature　field　and　post-fire　aseismic　performance　test　results　of　8　large-scale　steel　reinforced　concrete　(SRC)　columns,　the　load-displacement　skeleton　model　defined　by　key　points　including　a　cracking　point,　a　yield　point,　a　peak　point,　and　an　ultimate　point　is　proposed　considering　the　influence　of　fire　duration　and　axial　load　ratio.　The　formulas　to　calculate　these　points　are　recommended　through　theoretical　analysis　and　data　regression.　Meanwhile,　the　relationship　between　unloading　rigidity　and　elastic　rigidity　is　suggested　through　data　regression.　A　four-linear　restoring　force　model　is　put　forward　on　the　basis　of　the　above　work.　It　can　be　concluded　that　the　calculated　restoring　model　agrees　well　with　the　test　result,　which　can　be　applied　to　estimating　the　seismic　behavior　and　nonlinear　dynamic　analysis　of　post-fire　SRC　columns.　©　2016,　Engineering　Mechanics　Press.　All　right　reserved.