Abstract: This paper summarizes the technical route and achievements in the preparation of the flood forecasting scheme during the construction period of Lijiayan Reservoir. According to the hydrological station network of the Lijiayan water regime monitoring and forecasting system, the forecasting reference station is selected, and the basin terrain and water systems are combined for partitioning and dividing the calculation units. The Xin'anjiang hydrological model with three water sources is selected for model parameter calibration. The simulation results of 10 flood events at Tiesuo Station are statistically analyzed, and it is initially determined that the accuracy level of the forecasting scheme reaches grade B. The real-time flood forecasting function is developed for scheme verification analysis and relevant application improvement suggestions are put forward. Due to the fact that the years and quantity of historical flood data collected do not meet the requirements of the specifications, and there are problems such as missing data of rainfall stations, the difficulty in checking the flow accuracy of hydrological control stations, and the absence of representative evaporation stations in the basin, it will affect the model parameter calibration and its forecasting accuracy to a certain extent. It is expected that this forecasting scheme can be regularly revised and achieve better results through further accumulation of flood data in practical applications.