There are serious water environmental problems in Yangtze River area: coexistence of ecological and estuary poverty in the source area and river basin,serious cross- border water pollution. River and sea partition system is lack of regional cooperation,which exposed obvious limitation. First,in the deployment of river basin water pollution prevention and control,we often neglected the decisive role of the estuarine water environmental capacity; Secondly,in the deployment of estuarine water environment gover...