Based on the characteristic analysis of satellite images during short time rainstorm in Hubei Province, by using the real time satellite data and collecting the characteristic parameters of the images related to the short time rainstorm, a probabilistic short time rainstorm forecasting method is presented, which is regionalized with a lead time of 0 to 6 hour, in combination with NCEP numerical forecasting products. The results show that the selected characteristic parameters can reflect the different characteristics of short time rainstorms, and the calculating method is reasonable and plays a certain guidance role in short time rainstorm forecasting, but it should be improved in the aspects of false and miss forecasting rates.