Aiming at the problem of effects of water and sediment conditions after impoundment in the Three Gorges Reservoir on the channel conditions of Dongbei waterway,the evolution trend of the channel of Dongbei waterway is studied.Based on the physical moving bed model experiment,the trend of water level,velocity,flow state,terrain and channel conditions of Dongbei waterway under the water and sediment conditions of typical year and series year is discussed.The analyzing result reveals that,in the absence of engineering,the development of the channel conditions of Dongbei waterway is unfavorable due to the decrease in the amount of incoming sediment after the Three Gorges Reservoir is impounded;after the project is implemented,it can curb the unfavorable trend and maintain the current better shoal pattern and navigation conditions,thus there is less influence on water level,velocity distribution and nearshore velocity along the engineering section,and it can lay the foundation for further improvement of the channel scale.