The existing research on the scale of the Yangtze River waterway focuses on the minimum maintenance scale of the waterway under low water conditions，and lacks corresponding research on the scale of the waterway during medium flood periods.This article is based on the characteristics of water level and terrain changes since the use of the 175 m water storage in the Three Gorges Dam.It proposes to use the lowest water level from the 175 m experimental water storage in the Three Gorges Dam to the end of 2021 as a verification method for overlaying the available water level with the most unfavorable terrain during the recent mid flood period.Key waterways are screened and combined with actual measurement scales to explore the potential for channel scale improvement.The results indicate that the verification method has good adaptability to the potential analysis of channel scale during medium flood periods.On the basis of low water maintenance，the Wuhan to Anqing section of the lower reaches of the Yangtze River has the potential to use natural water levels to enhance channel maintenance scale during medium flood periods.