Research on the Barrier-Free Design for urban old people based on the concept of “green and sustainability”

Since 1977, Germany carry out a project named “Blue Angel Program” which standardized the products manufacturing and using procedure in fulfilling the demands of environment protection. Moreover, it will grant the symbol of “Green Production” to the commodity which is harmless for both human health and environment. The commodity without the symbol will be restricted during import and export at both number and price. After that, western world and Japan began to build their own green certification system to promote the production of products with low pollution oreven barely free pollution.