Path sound barrier is a kind of acoustics baffleplate installed between the source of traffic noise and the protection zone in both sides of the road，and it is one of the important measures to reduce the regional environmental pollution from traffic noise to areas in both sides of the road.Once falling across the barrier，traffic noise reflects and shapes sound shadow area in the back side.only part of the sound can get across the peak of barrier and reach its back side. The essential principle of the design of sound barrier is to make sound accepting point within sound shadow area ，assuring that sound barrier can turn back direct sound from sound source and reduce diffraction as much as possible.Moreover，path sound barrier should be  efficient ，safe，credible，economical and beautiful.
　　Path sound barrier is mostly applied to outdoor places, such as road traffic (highway,viaduct,and light rail road), railroad,port and dock,airdrome and so on.