Abstract：In this paper, viscoelastic damping materials and unidirectional glass fiber composite materials were used to make two kinds of constrained damping structures. The damping and mechanical properties of these two structures are studied. By finite element simulation study, the parameters of the constrained damping structure used on typical aircraft cantilever beam were designed and analyzed. The effects of the thickness of damping layer, the thickness of constrained layer and the size of the structure on the vibration response of the structure are studied. The constrained damping parameter law for cantilever beam structure is obtained. Vibration test experiment was designed based on the optimized parameters and the suppression effect of the constrained damping structure on the vibration response of the structure is verified.