Abstract: To verify the distribution of precipitation by flood forecast based on hydrological model, the feedback model between land surface and atmosphere based on GRAPES and GRAPES Meteorological-Hydrological coupled Model developed by the author's meteorological model are used. Xin’anjiang model which is used in this paper has already been widely applied in flood forecasting and hydrological simulation in China for a long term. The result of hydrological model driven by forecast datasets of GRAPES feedback model for flood forecasting is compared with the result of GRAPES Meteorological-Hydrological coupled Model. The experiment results show that the hydrological model can be used for verification of precipitation prediction. This method can be used in the ungauged region and the region with sparse meteorological stations.