Abstract:Based on the hourly rain intensity data in 485 stations of China durin g 1991 to 2005, the Spatial Temporal distribution features of hourly rain inten sity are analyzed with probability distribution analyses and statistical test. The hourly rain intensity was divided into four levels，more than 1 mm, 2 mm, 4 mm and 8mm per hour. The hourly rain intensity distribution character in differe nt levels was analyzed for the whole year and the distribution of the maximum of hourly rain intensity. Then, the daily variation of rain intensity was investig ated. The results showed that the features of daily variation were different in different areas and obvious in the West South and the South China. Furthermore, the recurrence periods of 50, 100 years of the maximum of hourly rain intensity were estimated primarily. It seemed that their distribution trends were consiste n t. The maximum area can be found in the southeast coastal range. The maximum of hourly rain intensity in 100 years can reach 100-150 mm/h in these regions.