In order to effectively solve the problem of flood peak water level forecasting under the influence of scour and silt, taking Majiatan Hydrological Station as an example, the main control station of Bashui River Basin, based on the analysis of the characteristics of water level-discharge relationship of the hydrological station, a forecasting model of flood peak water level affected by scour and silt was established by using the guided standard section method. The results of case study show that the prediction accuracy of water level is high, which can meet the prediction accuracy requirement of Majiatan Hydrological Station and solve the problem of flood peak water level forecasting affected by scour and silt.