There are a large number of confluences at the trunk line of the Yangtze River. In these confluences, flow movement and river bed scour and silting characteristics are extremely complex, and the navigation is more serious. Therefore, the ADV is used for bend type confluence to study characteristics of flow movement by model experimental research. Research results show that, the discharge ratio and the inflow angle that is between mainstream and branch are the main factors to effect characters of flow movement.The inflow angle is one of the main factors for determining the separation area of eddies, and the separation area of eddies increase gradually as the inflow angle and the discharge ratio increase.