Abstract:

Since 2003 year,low water level has hold very long times in Poyang Lake during the dry season.The water supply,the irrigation,and shipping are influenced seriously and the water environment,the wetland ecosystem and habitats of the migratory birds are also damaged.In order to solve dry up problem and improve the water environment in Poyang Lake,the basic principles were advanced based on the Ecosystem Approach.These principles include:(1) to regulate the withered water level but not control floods；(2) to benefit both the Yangtze River and Poyang Lake；(3) to keep friend with the ecosystem；(4) to increase the advantages and to reduce the harm；(5) adaptable management.Then the site,size and the operation rules of the Water Level Regulation Project during the dry season were suggested.As taking the ecosystem and environment protection as the main goal,the project may achieve a lot of benefits that include improving the water environment,to protecting wetland ecosystem in Poyang Lake and the lower reaches of the Yangtze River,and promoting the development of the society and the economic in region of  Poyang Lake.

Key words: ecosystem approach/ Poyang Lake/water level regulation/ dry season, ecosystem and environment protection