In recent years,Dongbei waterway beach III to Xinba coastline collapses seriously,and the left edge of beach III continues to wash back,which leads to a significant increase in the river width.Based on the analysis of river bed evolution,and combining with physical model test results,we discuss the effect of waterway regulation of Dongbei waterway in the lower reach of the Yangtze River.After the implementation of the regulation engineering,Dongbei waterway’s channel scale can reach 4.5 m × 200 m × 1050 m.