The sediment concentration in the Yangtze River Estuary has been decreasing due to changes in sediment discharge. The Three Gorges Reservoir has worsened this trend. The South Branch and offshore areas show decreasing sediment concentration, while the North Branch remains stable. The peak sediment area has shifted inland. In the South Passage, sediment concentration has decreased, while in the middle section it has increased. In the North Passage, sediment concentration has decreased overall. Overall, the sediment discharge decrease has led to synchronized decreases in sediment concentration, but some areas show increasing trends.