Using daily minimum temperature of land surface and precipitation data in winter of Guizhou province during the period of 1961—2010,the characteristics of spatial and temporal variations on the persistent land surface freezing are investigated.Results show that persistent freezing occurred in high frequency in the west part of 26.5-27.5°N regions of Guizhou,including 6-9 slight freezings(lasting for 1-3 days),3-6 moderate freezings(4-6 days),2-4 heavy freezings(7-11days) and 1-2 torrential freezings(over 12 days) annually.Overall,there are downward trends in the freezing frequency at different levels in most parts of Guizhou.The extreme events of persistent land surface freezing always occurred in January or the first half of February,with the thresholds as exceeding 10 days in the central,west and northwest of Guizhou accompanied by serious hazards.