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Poyang Lake is the greatest freshwater lake in China, with a seasonal cycle of high and low water level every year.The lake is mainly surrounded by large floodplain wetlands and is thus also the largest lake-wetland area in China.According to the characteristics of the hydrological cycle in Poyang Lake, we can divided the hydrological cycle each year to four hydrological phases: low-water level phase,increasing water level phase, high water level phase and decreasing water level phase.