Abstract: 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.