The Ouchikou waterway is one of navigation obstruct rivers on the middle Yangtze River.The first phase of the project initially stabilizes the pattern of the breach and slot through,which ensures excellent channel condition during the dry period.However,the first phase of the project may not adequately control the navigation trough boundary,and unstable factors exist in the channel river,so it is necessary to implement the second phase of the project.Two schemes for the second phase of the project are presented,which are studied respectively by physical modeling.The comparison and analysis for the engineering effects may contribute to choosing the engineering scheme.