In order to promote economic development along the coast,the middle reaches of the Dongjiang River will carry out capacity expansion and upgrading projects,which will be upgraded from grade V to grade III.However,because of the dense shoal and narrow channel,the effect of multi-shoal linkage should be taken into account in the regulation.The regulation method is different from that of single shoal,which makes the regulation difficult.Based on the hydrological and topographic data and the analysis of the beach characteristics of each obstructed sandy shoal,the regulation principles and measures of dredging as the main method and regulation and dredging as a combination are put forward.Through model tests,the scheme of excavating double-section channel is proposed to solve the problems of water flow return,flow velocity increase and flow pattern deterioration caused by the excavation of channel in long reach,and the distribution of dredging siltation is obtained based on the movable-bed test.The test results show that the regulation effect is good,and the whole river reaches basically meet the design requirements after the implementation of the scheme,which can provide reference for similar waterway regulation projects.