The construction of the middle route project of South-to-North water diversion has brought rare opportunities for development of key water source area--Shiyan city, but at the same time, general manager of Shiyan shoulder the heavy burden to provide water quality and quantity of middle of South-to-North water transfer project, and facing the grim challenges. In order to achieve the sustainable development of environmental protection and social economy of key water source area, build a harmonious socirty,ensure the water quality supplied by the ...