Abstract: kinds of main chenical components of aroma in flue-cured tobacco were identi-fied by GC/MS. Components in cured leaves of different pH value around roots were quanti-tatively determined by GC. The main chemical components of aroma matter gained wereneopphytidiene;nicotine;solanone;benzeneacetaldehyde;1O-isopropyl-3,7,13-trimethl-2,6,11,13-tetradecaen-1-ol;cembratrienes,etc. Contents of aroma chemical components in flue-cured tobacco under different pH value were obviously different.pH value between 6.5 and7.5 was benificial to aroma quality of flue-cured,and pH value above 8.0 had an un-favourable effect on the formation of some important components of aroma matter. In addi-tion,it was possible that pH value around roots influenced aroma character of flue-cured to-bacco.