Abstract: Fiber reinforced polymer (FRP)-steel composite circular tube confined concrete has been studied extensively in recent years due to its excellent comprehensive properties, however, a complete computational model to predict the stress-strain curve is still lacking. On the basis of the author's existing research results, the axial compression test results of 96 FRP-steel composite circular tube confined concrete columns were extensively collected and the influence rule of specimen parameters was systematically analyzed, a complete calculation model of stress-strain curve of FRP-steel composite circular tube confined concrete was presented, including the calculation methods of peak stress, peak strain, ultimate stress and ultimate strain, and the prediction model of the whole stress-strain curve was proposed. The model can predict the characteristics of the stress-strain curve of FRP-steel composite circular tube confined concrete, and the predicted results are in good agreement with the test results. The proposed model has good universality and accuracy.