Yanziwo waterway is one of the key navigation-obstructing shoals in the middle reach of the Yangtze River waterway,which has the plane characteristics of straight braided channel,and navigation-obstructing shoals are easily formed at the branched estuary.When the scattered shoal emerges,the navigation-obstructing problem is the most serious.After the implementation of the Three Gorges project,some adverse adjustments appeared.Already running project had guarded the key section.However,with the increasingly impact of the Three Gorges project,the channel condition of Yanziwo waterway is still instable.This paper analyzes the evolution of the river bed and characteristics of the navigation obstruction before and after the construction of the old project and proposes the regulation ideas and solutions.It also puts forward the engineering structure design,focusing on the refinement and optimization processing of the new and old engineering convergence.The research result may provide experience for similar regulation engineering design of the Yangtze River waterway.