Effects of different air-curing treatments on aroma constituents of tobacco leaves were studied by using the electric-heated flue-curing barn designed and made by Henan Agriculture University. The results showed that tobacco air-curing 48 h then baking could increase the contents of main neutral aroma constituents such as β-damascenone, gerany lacetone, a giant buan three diluted ketone benzene, methanol, furfural by 37.56%, 13.96%, 60.40%, 22.22%, 90.97% respectively，and the contents of malic acid and citric acid by 15.52% and 55.2% respectively, while the content of linoleic acid, linoleic acid and linoleinc acid could be reduced by 308.51% and 305.04% respectively.