Based on the monthly precipitation and the rainstorm days data at 84 ground meteorological observation stations in Guizhou during 1982~2009, this paper uses compose, variance and EOF for analysising the spatial and temporal distribution from June to July in Guizhou, and then using the wavelet analysis, trend analysis and mutation test for discussing climatic characteristics of the rainstorm days data from June to July in Guizhou. The results show that: there is a consistent spatial and temporal distribution between the rainstorm days and precipitation, and the rainstorm account the amount of precipitation for the major present from June to July in Guizhou in recently 30 years. The spatial distribution has the characteristics which contain three heavy rainstorms centers and two storm-prone areas. The heaviest rainstorm centers locate in the southwestern Guizhou, around the Liuzhi,Qinglong and Zhenning. The change of the rainstorm days is a more period in 1990’s and a less period in 1980’s and 2000’. The time series of EOF mode1 has the significant 3~5a interannual period. The trend has three stages(1982~1990,1991~2000 and 2001~2009), which shows was down-up-down changes, and has no mutation point.