Abstract: In order to investigate the chemical components and style characters of upper flue-cured tobacco leaf from heavy flavor tobacco-planting areas of Hunan Province, and their relationships, in 2014 21 samples from 5 tobacco producing areas were analyzed by statistical analysis, variance analysis, and stepwise regression analysis. The results showed that:1) Strong-flavor type upper flue-cured tobacco in Hunan had the characteristic of medium sugar, proper nicotine and high potassium. 2) Strong flavor type in upper flue-cured leaf from heavy flavor tobacco-planting areas of Hunan Province was prominent, with burnt-sweetness aroma, hay-like scent, burnt aroma, woody aroma, nutty aroma, pure-sweetness aroma and spicy flavor as the principal notes, particularly burnt-sweetness and burnt aroma. 3) The quality of aroma in upper flue-cured leaf from heavy flavor tobacco-planting areas of Hunan Province was fine, characterized by plenty of aroma. Diffusiveness was fine, and the scorched odor and ligneous odor was a little, and raw green odor and green odor were tiny. Smoke was smooth, soft and mellow. After taste was purity and easiness with a little irritancy and dryness. 4) Stepwise regression analysis showed that the influence of total nitrogen and sugar/nicotine to pure-sweetness aroma were significant; the influence of nicotine, reducing sugar and sugar/nicotine to burnt-sweetness aroma were significant; the influence of sugar/nicotine to burnt aroma, strong-flavor type, motion state of aroma and density of smoke were significant; the influence of nicotine and potassium to strength were significant; the influence of potassium to aroma quality, softness and mellowness were significant; the influence of total sugar and chlorine to diffusiveness were significant; the influence of total nitrogen and potassium to scorched odor were significant; the influence of reducing sugar to irritancy was significant; the influence of nicotine to dryness was significant.