Abstract: The concept of tobacco aroma type is proposed, that is: the aroma type is the classifications of overall aroma characteristics from smoking tobacco leaves. With reference to previous studies, the composition of aroma type of flue-cured tobacco was summarized as Two Notes Theory based on the note analysis of clean aroma type, full-bodied type and moderate type used in China. Then, the problems existed in Two Notes Theory, nomenclature of aroma type, standard of aroma type and standard sample, and moderate aroma type are discussed, suggestions for improvement is also presented.