In recent years,during the construction of many bridges,obvious changes have taken place in the channel of the project reach.In order to solve this problem,taking Jingyue Yangtze River Highway bridge pier foundation construction stage as an example,the measured hydrology and topography before and after construction are compared.The results show that the trestle and water construction platform set up during pile foundation construction have caused great changes in Dingjiazhou beach and Nanyangzhou head zone,and has accelerated the development trend of channel conditions in some reaches to the adverse direction,which shows that bridge foundation construction has a great impact on channel evolution.In order to avoid the adverse effect as far as possible,the influence of the possible construction scheme on the channel should be considered in advance in the early stage of span study.If it is difficult to eliminate or reduce the impact by adjusting the construction scheme,the layout scheme of bridge span and pier must be optimized.The analysis results can provide reference for subsequent bridge construction management.