By using the daily mean rainfall data of 26 stations in South China from 1958 to 2000,the climatic features of the rainfall of rain storms during the preflood season in South China have been studied.The results show that :(1)the rainfall of rain storms and its frequency exhibited obvious interannual and interdecadal decreasing tendencies;(2)about one half of the rainfall of rain storms precipitated in the preflood season with the maximum center in Fujian and the north-west of Guangdong and the minimum in the southwest of South China;(3)the rainfall of rain storms accounted for about 40% of the total rainfall of the preflood season,and the maximum percentage(nearly 44%) of rain storm rainfall laid in the coastal area of Guangdong,and two minimum centers(about 26%) in Fujian and the east and west of Guangxi.