Abstract: According to the meteorological data in March and April recorded in 97 stations from year 1961 to 2005 and the digital elevation model data in Hunan province, regional distribution of the first date on which the daily temperature steadily pass 5, 8 or 10 ℃ which is suitable for flue-cured tobacco transplanting was analyzed by means of 500 m×500 m small grid interpolation based on GIS technology. The results are as follows: The first date in a year when 80 percent of daily temperature steadily pass 5 ℃ first appears from Feb.19 to 22 in Jiangyong county and Jianghua county, then appears after Mar. 13 in the high altitude area of Western Hunan and eastern Liuyang and from Feb. 23 to Mar. 13 in other tobacco areas. The first date in a year when 80 percent of daily temperature steadily pass 8 ℃ appears from Mar. 23 to 26 in most areas of Southern Hunan, from Mar. 26 to Apr.1 in the middle altitude area of Western Hunan, and in Taoyuan county, Linli county and eastern Liuyang city, and after Apr. 7 in the high altitude area of Western Hunan. The first date in a year when 80 percent of daily temperature steadily pass 10 ℃ appears from Mar.30 to Apr.1 in the south area of middle Hunan, from Apr.1 to 5 in the low altitude area of Western Hunan, and in Shaoyang and middle Chenzhou, and after Apr. 7 in the middle and high altitude area of Western Hunan.