Abstract: The temporal,spatial and cyclic distribution analysis of extreme weather frequency changes in Yunnan province have been analyzed by using the 123 points data in 1961—2008.The results of temporal distribution show that the rainstorm days increased significantly at the Midwest Yunnan;the gale and thunder days reduced obviously all over the province;the hail days reduced faintly all over the province; the fog days increased at central section and reduced at peripheral regions; and the frost days reduced at most province.The results of spatial change features show that the rainstorm events continued to increase slightly;the storm,gale and hail events reduced over time,and tended to extend steadily to the 21st century;the fog and frost events were steady in the 1990s and reduced rapidly afterwards.The results of cycle analysis show that the rainstorm,gale,hail and storm events frequency had a low-frequency cycle over 15 years at the same time.