Abstract: Constrained-layer damping composite structure was prepared with glass fiber reinforced resin as constrained layer main material, nitrile butadiene rubber as damping layer and steel plate as basic plate. Dynamic mechanical analyzer and cantilever beam resonance method were used to study the influence of temperature, stiffness of constrained layer and the structure of damping layers on damping effect of constrained-layer damping composite structure. The results show that the free damping composite plate exhibits highest damping range when the damping layer is in glass transition region and extends to the high elastic state region when pasted with glass fiber reinforced plastics as constrained layer. Increasing the thickness and porosity of damping layer will improve the damping property of constrained-layer composite plate. The effects of aluminum plate which pasted as constrained layer is particularly significant. Aluminum plate cannot be used as constrained layer because of the serious corrosion in sea-water and dry/wet cycling strong corrosion occasions. Anti-corrosion glass fiber reinforced plastics is preferred under these special occasions.