Based on virtual work principle, a new modeling method for constrained damping p late is presented in this paper. This method is developed with laminate theory. The frequency dependent modulus of viscoelastic material is desc ribed by GHM (Golla Hughes McTavish) method. Thus a standard linear system wit h constant coefficient is obtained. The effectiveness of this method is validate d by experiment and FE analysis. It is proved that this method has good accuracy.