The present paper made an analysis of the features of the land, water, climatic and biological resources of Poyang Lake, the largest body of fresh water in china, whose water-covered area shows great variation between the flood and the dry seasons. It is a lake of transit water, the maximum recorded annual runoff, being 1, 457×108m3. Yet the great fluctuation of its runoff in different months and different years renders its function in storing and regulating the water of the Changjiang River limited and inopportune. On the other hand, the Poyang Lake is a high-valued district in sunshine hours, water evaporation and wind energy, it serves as a temperature moderator.Abundant in bioresources, the lake formed an integrated water ecosptem and a water-land alternated landbeach-grassy sandbar ecosystem. Finally, the author put forward the strategy of renovating poyang Lake by harnessing its water system;bringing the lake level under artificial control;harmonizing the relationship between Poyang Lake and the Changjiang River and making full use of the comprehensive advantages of the fake's resouces.