After construction of the Three Gorges Dam,the runoff yield and flow concentration have been changed significantly,which shortened the effective forecast lead time.Therefore,one effective method to deal with that problem is to put the precipitation data in the hydrological model,and develop the quantitative precipitation forecasting model in real time meteorological forecasting.A forecasting model to predict the daily reservoir inflow with the medium-term meteorological forecasting as the model input was introduced in this paper.The combination of medium-term meteorological forecasting with the hydrological forecasting model to analyze the sensitive elements for the hydrological forecasting was developed for the Three Gorges Reservoir area.With performing of the model,acceptable results have been obtained,which can also be applied to other reservoirs with medium-term meteorological forecasting requirement.