Abstract: In mid-July, the No.1 flood in 2024 occurred in the Hanjiang River, and the relative department made accurate forecasts and scientific operations, effectively ensuring the safety of flood control in the basin.Through the analysis of the flood development process, flood forecasting, and reservoir operation, we summarized the flood characteristics, hydrological forecasting accuracy, and the achievements of reservoir operation.The results showed that during the No.1 flood, Hanjiang River Basin experienced a flood that was close to 5-year frequency, with the flood of the Danjiangkou-Huangzhuang interval area over 20-year frequency.The reservoir implemented an operation way of flood detention and peak reduction, playing a huge flood control role and significantly reducing the flood control pressure in the middle and lower reaches.Through the operation, the peak water level was lowered by about 2.0～2.5 m at the stations in the middle and lower reaches, avoiding exceeding the warning level in the Huangzhuang section and exceeding the guarantee level in the section below Xiantao Station.The research results can provide a reference for the refined flood forecasting and scientific scheduling of reservoirs in the basin.