Weather radar rainfall is one of the important information for runoff simulation and flood forecasting. Because each grid point rainfall value is susceptible to error, and radar rainfall error decreases as the temporal and spatial scales increase, high resolution does not necessarily equate to higher accuracy in applications such as hydrological simulation. In this paper, the Fractions Skill Score(FSS) and HEC-HMS(Hydrologic Engineering Center's Hydrologic Modeling System) are used to analyze the influence ...