To classify the browning degree of tobacco leaves, the stepwise discriminant analysis was used to discriminate the different browning grades of tobacco leaves on the positive and negative sides of 100 aged Hubei tobacco leaves based on 5 color values including brightness (L), red (a), yellowness (b), saturation value (c) and hue angle (c), and the discriminant function was established. The result showed that color value L, a, c and h on the positive of tobacco leaves entered the discriminant function. Self–verification and cross–examination were used to judge the original samples, the total accuracy was 99.0%, and the discriminant accuracy for the 25 validation samples reached 100%.