Most of China's inland waterway construction started in the 1960s. With the increase of inland water transportation, inland water conservancy hubs need to be upgraded, especially in the complex terrain - curved branching river to establish navigation buildings to ensure navigation, improve transport capacity is extremely important. This paper studies the navigable flow conditions in the mouth area of the typical curved branching river of Qingshan Junction, explores the characteristics of the peer flow of the curved branching river, and puts forward an analysis model of the flow movement characteristics of the curved branching river, which can effectively improve the navigable flow conditions in the mouth area of the curved branching river and enrich the model base and knowledge base of the curved branching river. It has very important practical significance and engineering value for shipping safety and waterway management.