For studying the aroma note of flue-cured tobacco quantitatively, the sensory evaluation data of aroma notes and intensities of 3 samples of typical medium, robust and fresh flavor style flue-cured tobacco and 893 flue-cured tobacco samples from plateaus in low latitudes were analyzed with principal component analysis, an aroma note index which could extremely significantly distinguish the 3 typical tobacco samples by their aroma note characteristics was proposed and applied to the division of tobacco growi...