In order to understand the influence of river scouring on river water level from Danjiangkou to Wangfuzhou section, the variation rule of river water level under medium and high water condition is clarified. Based on the measured water level and flow data of Wangjiaying, Huangjiagang and Laohekou water level stations, the watercourse roughness of different magnitudes of flood are calibrated and used to calculate the one-dimensional steady flow since 1967. The results show that the river level under the condition of medium and high water is closely related to the river scour. With the river scour, the river flood level presents a decreasing trend when the river is confronted with the same flood in 1964 and other medium and high floods, and the average lower water level of the current river section is 1.6 m lower than the actual water level in 1964. With the stabilization of channel scour, the decrease of flood level gradually decreases, from the average decrease of 0.61 m in the initial stage of operation to 0.19 m in recent years. The flood level tends to be stable with the balance of river scour and silt.
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