Abstract: To investigate the stress-strain behavior of geopolymer concrete (GPC) under multi-axial stress states, axial compression tests were conducted on GPC columns with and without carbon fiber reinforced polymer (CFRP) confinement. The characteristics of stress-strain curves for GPC under various confinement conditions were examined, and models for axial stress-strain, compressive strength, and ultimate axial compressive strain were established. Specifically, novel expressions for model parameters were proposed for CFRP-confined normal strength GPC, and the model was validated using experimental results from other studies. The results demonstrate that the compressive strength model has good predictive capability, with an average absolute error of 3.55%. Additionally, the ultimate axial compressive strain model accurately predicts experimental results from other studies, with an average absolute error of 17.03%. The newly proposed parameter expressions for the axial stress-strain model are applicable not only to CFRP-confined high-strength GPC but also to CFRP-confined normal strength GPC.