Abstract: To analyze Xiushan County rainstorm climate law and its causes, the annual and seasonal changing features of 173 rainstorms in Xiushan during 1971-2010, the change of the local meteorological elements, and the evolution of high-altitude circulation situation were statistical analyzed to identify climate background and circulation situation for rainstorms in Xiushan County. Results showed that, before the rainstorm, there were often temperatures rise, water vapor pressure increase and pressure drop. When aerial circulation situation met one the following situations: the two high-latitude trough of a ridge, northeast low groove, cutoff low-pressure type and typhoon inverted trough, there would be a regional rainstorm process within the next 24-48 hours. A forecasting model on the rainstorms in Xiushan County was obtained through statistical analysis and could provide certain reference.