The contents of nit rogen and phosphorus and ferrous in the column sediments and their interst itial water were analy zed and compared in the main regions of Taihu Lake in 1998.The results show that the upper layer(0-10cm) contained higher contents in TN and TP and than the lower.And NH₄-N and PO₄-P in the interstitial water are a bit higher in the seriously-polluted waters than those in the gent ly-polluted waters.However, those of the lower layers are slightly higher in the gently-polluted waters than those in the seriously-polluted.It was indicated that there was no distinct corresponding relationships between NH₄-N/PO₄-P contents in the interstitial water and TN/TP contents in the sediments.The ferrous concentration in the interstitial water is distinctly in positive correlation with NH₄-N content (R=0.9234).