Abstract:

The ThreeGorge Project，one of the extremely huge hydroworks in the world，has comprehensive benefits of floodprevention，electricitygeneration and waterbornetransportation，however，due to descending of selfpurifying capacity of water，its water environment safety has become the hot spot of concerns in China and around the world.The water environment safety of the ThreeGorgeReservoirArea concerns not only on waterusing safety in the reservoirarea and middle and lower reaches of the Yangtze River，actualizing successfully of the SouthtoNorth Water Diversion Project，but also on the ecological safety in the Yangtze River streams and success or lost of the ThreeGorge Project.Furthermore it counts for much the sustainable development of the whole country.With the sustainable development theory and systems engineering theory as direction，this paper analyzes the status quo of the water environment safety of the ThreeGorgeReservoirArea and the main factors affecting its water environment safety，then it puts forward some important strategic countermeasures，such as specifying the ThreeGorgeReservoirArea and its upstream waters as a special preservation water area，reforming the drainage basin management system，enforcing compensation mechanism of water environment preservation，perfecting the laws and regulations of water environment preservation and strengthening the construction of emergency mechanisms so as to ensure the water environment safety of the ThreeGorgeReservoirArea.

Key words: ThreeGorge ReservoirArea, water environment safety, strategic countermeasures