The development of the middle branch of Anqing waterway in the downstream of the Yangtze River has a great influence on the river regime and the stability of its left branch.Therefore,waterway regulation project was implemented to control the middle branch.Analyzing the causes of the middle branch’s formation and rapid development according to the observed hydrologic data during the project,and carrying out experimental study on the branch control scheme,we put forward the recommended scheme.The engineering effect analysis of the project indicates that by controlling the branch with the bottom protection structures,we can improve channel conditions.