[ Objective ] The present study was conducted to improve the aging quality of tobacco leaf and to achieve the availability of the ciga- rette materials. [ Method]The total sugar, reducing sugar, nicotine and the change law of sugar-nicotine radio of two parts of flue-cured to- bacco lamina from six raw material bases in Guizhou Industrial Co. , Ltd. were analyzed. [ Result] (i)In the aging process of flue-cure to- bacco, the contents of the total sugar and reducing sugar in different aroma types of flue-cure tobacco lamina of three mellowing ...