Abstract: Constrained by the poor discharge of Luoshan bottle- neck reach, the Yangtze River flood is concentrated near Chenglingji site in the main stream of the Yangtze River. Dongting Lake, as the key flood regulation and storage place, has a significant impact on the flood prevention of the Yangtze River to Jingjiang-Hankou reach. The characteristics of flood near Chenglingji are introduced, and the adaptability of flood control and storage water level raising of Chenglingji is analyzed. It is proposed to raise the control water level to 35.8m under the current situation of the rivers and lakes, and with the joint operation o the Three Gorges Reservoir and the upstream cascade reservoirs, the flood peak of Chenglingji will be reduced. The volume of flood storage can be increased by 6 billion m³, and the excess flood near Chenglingji will not exceed 20 billion m³. By raising the control water level of Chenglingji site, not only the existing planned flood storage pattern in the rivers and lakes can be maintained which can ensure the flood prevention safety in the middle reaches of the Yangtze River, but also the difficulties of flood prevention in Dongting Lake district can be solved.