In order to reveal the characteristics of nutrient pollution and its pollution sources in lake sediments in the city, and to provide a new perspective for the assessment of the environmental effect of comprehensive water environment management, the contents of TN, TP and OM in sediment columnar samples at 25 points in Yiai Lake in Huanggang City were collected and measured, the water quality of overflow sewage from 9 points and outlets of the lake was monitored, the spatial distribution characteristics of lake water quality and sediment nutrients were analyzed, and the sediment pollution risk was assessed by comprehensive pollution index method, and cluster analysis, carbon-nitrogen ratio (C/N) and carbon-phosphorus ratio (C/P) were used A combination of methods to analyze the sources of nutrients in lake sediments. The results showed that: 1) There were spatial differences in the distribution of TN, TP and OM in sediments. The horizontal distribution of TN, TP and OM contents ranged from 940~3677, 323~1667 mg·kg-1 and 1.03%~7.44%, and the overall vertical expression was surface >The contents of TN, TP and OM in the middle and bottom layers and surface sediments ranged from 920~4450 mg·kg-1, 208~1970 mg·kg-1 and 2.05~7.48%, respectively. 2) The TP content of surface sediments was higher than that of the lakes in the middle and lower reaches of the Yangtze River, and the results of the comprehensive pollution index method showed that the TP pollution of surface sediments was serious, and the total phosphorus in 52% of the lake area was in a moderate and severe pollution state, and the degree of TN pollution and comprehensive pollution was low. 3) The nutrient distribution of surface sediments was affected by overflow discharge, non-point source pollution and endogenous release, and the C/N value of surface sediment was 10.67, and the C/P value was between 20.16~190.97. TP mainly comes from non-point source pollution, followed by overflow sewage. The source of TN is similar to that of OM, which is derived from about 45% of endogenous release and 55% of non-point source and overflow pollution.