Dongliu waterway is the typical multi-branch straight reach in the lower reach of the Yangtze River.It is the key navigation-obstruction waterway in the lower reach of the Yangtze River and the bottleneck of navigation improvement in the Yangtze “Golden Waterway”.Recently,experiencing the “west channel clogging,waterway adjustment and implementing the second phase of the regulation project,Dongliu waterway’s evolution appeares new changes and new trends.According to the latest measured data,this study analyzes the evolution characteristics and navigation obstructing characteristics,reveals the influential factors of channel change,establishes two dimensional mathematical model of water and sediment,and predicts the evolution trend of Dongliu waterway in the future.Based on that,the study proposes the main maintenance countermeasures and suggestions,which provides reference for the waterway maintenance and waterway regulation of the same kind.