Alcohols' aroma is the intrinsic and normal aroma of liquor. There is certain difference in alcohols' aroma for liquor of different flavor types. Alcohols' aroma is mainly produced by the volatilizing ethanol (featured by ethanol aroma). The alcohols' aroma of liquor is correlated with the varieties and the quantity of alcohols contained in the liquor. The alcohols in liquor have the functions of both producing aroma and improving aroma.