Abstract: Using semi-distributed HBV hydrological model, the hydrological data and meteorological data of Jihe River Basin from 2006 to 2013 were selected in the first-level tributary of Weihe River Jihe Tianshui（II） hydrological station. The relationship between precipitation, discharge and water level is established in the basin above the hydrological station, and the precipitation at the precipitation-induced interface is determined. The results show that the Nash coefficient of the HBV model is 0.50 and the deterministic coefficient R² is 0.70. The Nash coefficient is 0.71 and the deterministic coefficient R² is 0.84 in the verification period. According to the measured discharge data of Tianshui（II） hydrologic station and the relationship between water level and precipitation in HBV model are used to determine the rainfall at the interface of basin disaster, and the three flood processes are selected to verify it. It is proved that the early warning effect of the rainfall index of the disaster interface based on the HBV hydrological model method is good.

Key words: HBV model, Jihe River Basin, area precipitation thresholds of rainstorm-flood hazard