The PVC indoors are recently emerging new generation of green environment-compatible products,comply with the state industrial policy orientation of "substituting wood with plastics, steel with plastics and aluminum with plastics", they are the high and new technology products which the state encourages to develop, these products are paintless, does not contain formaldehyde, have high strength and resist to aging, and are substantially superior to the similar products of other materials in terms of water resistance, moisture resistance, midew prevention, mothproofing, fire resistance, sound and thermal insulation, shock resistance,ect.