Dongliu waterway is located in the lower Yangtze River. In recent years, its waterway condition is getting increasingly bad. Based on the observed data, this paper analyzes evolution characters of the left beach of Dongliu waterway and the effect of the left beach’s evolution on the waterway condition. It points out that the new evolution characteristic of the left beach after implementation of the waterway regulation project is an important reason for the increasingly badding of the waterway condition. It also predicts the trend of the bed evolution of the left beach and the waterway condition, and points out that the main channel called Xigang may be still in a shrinking trend. These researches may serve as reference for the channel regulation ideas and engineering design in the follow-up project.