Abstract: Based on 500 m×500 m small grid interpolation，regional distribution characteristics of main climate factors in tobacco growing stage in Hunan were deduced.Based on characteristics of climate conditions and natural disasters during tobacco leaf growth period in Hunan province，and after evaluation of experts in industry，four climate factors，i.e.rainfall during field period，duration of sunshine，rainfall during mature period and maximum temperature≥35 ℃ for 5 days，were proposed to be selected as indicators of tobacco planting area planning.Based on level planning and GIS small grid technology，planting area should be planned reasonably.Planning results showed that cultivated land in most areas of Hunan province was suitable for planting tobacco，and the western part of Hunan province was the most suitable planting area.