(2)Firstly under the intervention of the government, building enterprises or contractor interact
with the resource utilization enterprises of construction waste and build up a chain of construction
waste resource utilization. In one side, under the limit policies building enterprises or contractor
transfer the construction waste to the enterprises of construction waste resource utilization; in the
other side the enterprises of construction waste resource utilization sold the recycle products to the
building enterprises or contractor with the support policies and support technique from scientific
research institutions.