In order to investigate the characteristics of shortterm heavy rainfall in Guizhou Province, the hourly rainfall data from 84 stations in Guizhou through 1991-2009 are analyzed, with defined a threshold value for each station by the method of threshold value. The distribution of threshold value shows that there are two heavy precipitation high value centers, the stronger one is in Wangmo, southwest in Guizhou, while the other one is in northwest of Guizhou. The precipitation event frequency increases gradually during April to June, maintains in July and begins to reduce during August to September. Precipitation often occurs during the three time periods of 23:00-02:00 BT, 05:00-08:00 BT, and 17:00-20:00 BT, there is very little precipitation event during daytime. Most of the heavy precipitation events occur in the evening in northwest Guizhou, while in the middle of Guizhou, heavy rainfall is concentrated in the time period of 23:00-02:00 BT, and then in 05:00-08:00 BT in the southeast Guizhou.