Aiming at the problems of the west waterway of Tongzhou Shoal,a large-scale regulation project was carried out in the west waterway of Tongzhou Shoal from 2011 to 2016,through which favorable conditions for the formation of stable double-branch river in Tongzhou Shoal branch channel.Based on the hydrological and topographic data measured in recent years,we analyze the new changes in the evolution of the west waterway of Tongzhou Shoal and the effect of the regulation project from the aspects of diversion ratio in the west waterway of Tongzhou Shoal,Tongzhou Shoal body,waterway erosion and deposition,as well as the waterway scale.The analysis results show that Tongzhou Shoal body is basically stable,the diversion ratio is increased by 2.4% in the west waterway of Tongzhou Shoal,the -5 m river channel is completed and the -10 m river channel below the Sigan River is completed,and the expected effect of the project is achieved basically.