The related constitutive model is needed when using fiber model to simulate the mechanical behavior of FRP confined concrete cylinder on OpenSees platform. Based on the skeleton-line constitutive model proposed by Jiang and Teng, the test results were compared with the calculation results under different peak stresses and strains, and more precise formulas were chosen and taken into the skeleton-line constitutive model. In the constitutive model, with the confinement effect of stirrup on core concrete taken into consideration, the ultimate tensile strain of FRP under hoop tensile failure was obtained by the reduction factors of ultimate hoop tensile strain. In addition, two different constitutive models were adopted to simulate the member according to whether considering the steel fatigue through the constitutive model. Both the relationship of axial stress and strain and the relationship of lateral strain and axial stress for the structural member were obtained, and the prediction results agreed well with the test results.