Abstract: The research aims to quantitatively assess the rainstorm disaster in real-time and provide effective guidance for the high- risk areas on rainstorm in Shaanxi Province. Based on the meteorological data of rainstorm in Shaanxi, the historical rainstorm disastrous data, the geographic data and the socio-economic data, the authors used the principal component analysis, entropy method and hierarchy process analysis to obtain the rainstorm disaster- inducing factor, hazard inducing environment vulnerability, bearing body vulnerability and resistance capacity. Meanwhile, combined with the GIS technology, the real- time risk assessment model of the rainstorm disaster was built in Shaanxi Province. The model was applied to the typical rainstorm disaster verification in 2011, and the assessment results were consistent with the actual disaster situation.