The Anqing reach in the lower reaches of the Yangtze River consists of three continuous branching channels including Anqing waterway,Taiziji waterway and Guichi waterway,of which the recent fluvial process is intricate.Based on survey hydrology,terrain data and mathematical model,we analyze the relevance of flow dynamics,velocity distribution,stage and the change of split ratio of three continuous branching channels,and suggest that the transition section between the branches and the stability of the key beach shoreline should be maintained in the river and waterway regulation project.The results can provide reference for similar project.