Aiming at the problem of conditions for waterway falling below planned scale in the Wangyemiao to Lanjiatuo river section of the upper reaches of the Yangtze River，we use the method of statistical analysis of the multi-year waterway forecast scale and the measured water level data，and refer to the actual waterway maintenance experience.It is concluded that the key waterways of this section are Wenzhongba，Dongxikou，and Chayuqi waterways.Conditions for waterway falling below planned scale of each key waterway are that the water level of Yangjiaotan in Luzhou is 0.95 m，the water level of Doulizi is 0.3 m，and the water level of Xiaotaozhu is 0.6 m.The plan to reduce the maintenance scale is reducing depth to preserve width.