This paper studies the evolution characteristics of Baimaosha waterway based on the topographic and hydrological data.It is found that under the new boundary condition of the waterway and actions of typical floods,the diversion point of stream moves to the southeast,but the confluence point moves to the northwest.The north channel talweg of Baimaosha waterway continues moving to the north,and the south one rarely swings between Xinjin River and Qiyakou these years.Sediment deposits on Baimaosha shoal,which leads to a increase of the area and volume.It is broad on the surface of Baimaosha waterway for the south channel when the area of the south channel increases but decreases for the north channel.The whole Baimaosha reach appears deposition when erosion occurs for the deep channel at the same time.