This paper described the basic concept of the technique for the modeling of coupled vibroacoustic system. According to the principle of WB method,the structural and acoustic domains were approximated in terms of wave functions and particular solutions. The acoustical and structural boundary conditions,and the continuity of the normal fluid and structural displacements along the coupling interface,were transformed into a weighted residual formulation,which resulted in a set of algebraic equations represented by the wave model.Solving the model for the unknown wave function contributions and backsubstituting the results into the expansions yielded the prediction of the dynamic response of the coupled vibroacoustic system.It was illustrated through a two dimensional validation example that the new prediction technique yielded a high accuracy with a substantially smaller computational effort,so that the new prediction technique could be applied to midfrequency analysis.