Based on the systematic measurment of nitrogen (N) and phosphorus (P) concentrations in lake water, the main river water, partial agricultural drainage, groundwater and urban sewage, we analyzed the present situations of N and P pollution at the Lake Poyang Basin, and discussed the sources of the pollution primarily. Lake Poyang Basin was polluted by N and P at some extent, while especially Rao River was polluted by N seriously and Xin River was polluted by P badly. The concentrations of total

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... itrogen and total phosphorus were 1.06±0.28mg/L and 0.067±0.042mg/L respectively in the Lake Poyang water and the lake has subjected to eutrophication status.