Abstract: In order to expand the application of energy finite element analysis in the prediction of vibration response of complex coupled structures, based on energy finite element theory and energy transfer coefficient calculation method, an energy finite element modeling and analysis method for non-coplanar stiffened structures was proposed. The rationality of the method was verified by comparing it with the calculation data in classical literature, and then the energy density distribution law of non-coplanar stiffened structures under single point harmonic excitation was obtained based on the analysis of examples, and compared with the case without reinforcement. The results show that the energy density of flexural wave in the structure under transverse excitation is significantly higher than that of the other two kinds of in-plane waves, and the existence of stiffeners will hinder in-plane waves.