Abstract: The compression stability of carbon fiber reinforced epoxy resin composite stiffened panel was analyzed by the engineering method and finite element model (FEM) respectively, and the critical buckling load and buckling mode of the stiffened panel were obtained. The experiments on the compression stability of the composite stiffened panel were conducted and the experimental results were compared with the calculated results. The results show that the composite stiffened panel had a certain post-buckling carrying capacity, and the failure mode consisted of the adhesive failure and fracture of stiffener and the tearing of skin. The error between the critical buckling load calculated by the engineering method and FEM method and that of experiment was 13.8% and -15.5% respectively. The results agreed well, indicating the accuracy of the engineering method and the reasonableness of the finite element model.