The spatial and dynamic variation of total nitrogen contents at different depths of sediments in 5 representative sites of Dianchi Lake (Haigeng, Dounan, Luojiacun, Xinjie, and Kunyang) were studied from May 2003 to May 2004. The results showed that:The average content of sediment total nitrogen was 4.91 g/kg with an annual range of 4.13~5.41g/kg. Sediment total nitrogen was influenced obviously by seasons, i.e., high in summer and low in winter. The peak and trend of sediment nitrogen content in different sites and at different layers were significantly different, which showed an order of surface > middle > bottom, varied at 3.54~9.10 g/kg, 2.72~8.04 g/kg, 1.23~5.37 g/kg, respectively. The nitrogen contents were higher in Luojiacun and Haigeng, while lower in Dounan and Xinjie.