Glass wool board has been able to fine sound due to its special structure. Structure determines function, this law is a vivid manifestation of glass wool board applications. Wool board is composed of numerous fibrous glass fiber, glass and formation of numerous voids. It is these dense small gap played the role of acoustic energy consumption: when sound waves through these gaps caused by the vibration of air molecules in the gap. Due to the viscous drag of the air and the friction of the air molecules and the pore wall, sound can be converted into thermal energy while the loss.