Based on the ECMWF, Japan, and T213 precipitation data from 2003 to 2006, using the SVM method and CMSVM application software, the crossvalidation with random samples and the gradual approaching of model kernel parameters are performed, and then the 24hour SVM heavy rainfall forecasting models are established for 16 subregions in the Wuhan region, which have been put to use in the realtime operation from May to July in 2007. The results show that the TS points for Hubei,Hunan and Henan are 33.59%, and 34.69%, 34.15% and 31.71%, respectively, which proved the forecasting capability and reference value of the SVM method.