Abstract: The spatial and seasonal distribution characteristics of extreme dry spells were analyzed by using daily precipitation data of 16 stations in southeast Guizhou province,China,from 1961 to 2009,using EOF,Mann-Kendall catastorophe test,linear trend estimate etc.to analyze the maximum number of continuous rainless days(days with <0.1mm rainfall) of each season.The results showed that the spatial and temporal variation characteristics of the extremely dry spells in each season of southeast Guizhou had great differences between years and regions.Autumn had the largest number of days of extreme dry spells,while spring had the smallest ones.In the first decade of the 21th century,there were trends of increase of dry spells in all seasons,only the increase in summer was not statistically significant.

Key words: Southeast Guizhou province, Southeast Guizhou province, Extreme dry spells, Non-uniformity