Abstract: The confluence bay region was formed in the northwest of Chaohu Lake because of the radial distribution of several inflow rivers, such as Nanfei River, Shiwuli River, etc. It is therefore very meaningful to know the cumulative distribution and release risk nutrients in this area for the pollution status evaluation. Hence, 17 sediment samples were collected to analyze the nutrient concentration and formations. In addition, the release risk of the nutrients from the sediments was evaluated using the statistical cultivation. The results showed that:1) the w(TN) and w(TP) ranged from 1399.3 to 3739.4 mg/kg and from 607.9 to 1602.3 mg/kg, respectively. The two parameters were higher than their mean values in the sediment of Chaohu Lake. 2) The ratios of w(NH₄⁺-N) to w(TN) were from 5.62% to 17.60%. Meanwhile, the ratio of w(Al-P) to w(TP) exceeded 50% in 16 sampling sites. The release fluxes of NH₄⁺-N and PO₄^3--P reached 14.27-128.24 and 0.07-13.00 mg/(m²·d) respectively, because of the high ratios of w(NH₄⁺-N) and w(Al-P). Moreover, nutrient release risks in the estuaries of Chaohu Lake were much higher than that in other areas in the bay. 3) The vertical distributions patterns of w(TN) and w(TP) indicated that the accumulation of nutrients initiated from the 1950s (a correspondent sediment depth of 24 cm) and accelerated sharply in the 1980s to the late 1990s. Therefore, sediments in the confluence bay was a vital pollution source to the water body of Chaohu Lake because of the high levels of w(TN) and w(TP) and the considerable release fluxes of NH₄⁺-N and PO₄^3--P. In conclusion, urgent measures must be taken to control the nutrients pollution in the bay, especially in the estuaries.