Based on the measured data of flow,sediment and monograph of Dongliu channel,we analyze the evolution characteristics,discuss the change of tomography after implementation of the waterway regulation projects,and predict the new the evolution trend using a 2D mathematical model.The results show that the Dongliu channel mostly erodes after one decade and local channel deposits sometimes.The range of erosiondeposition is 5 m.The spilt ratio of east harbor increases and the spilt ratio of west harbor and Lianhuazhou decreases after one decade.The left branch of Laohutan shoal deposits and the channel condition of west harbor worsens because of the deposition of Laohutan shoal,to which enough attention shall be paid.