Abstract: In order to explore the relationship between the tobacco quality and degradation of plastid pigment, we investigated the change of degradation ratio of plastid pigment during maturing in the field and the difference of degradation proportion during flue-curing of different harvest maturity by field experiment.The results were showed as follows: The degradation ratio of plastid pigment during maturing grossly showed a changing trend as letter“V”in middle and upper position, which means that the degradation ratio in prophase and anaphase of maturing was relatively high, while the metaphase was relatively low. The changing trend of degradation ratio of chlorophyll and carotenoid in different position was slightly different. The degradation proportion of plastid pigment of different harvest maturity during flue-curing was obviously different, 99% of cholorophyll and 53%-73% of carotenoid was degraded during flue-curing. Suspending harvest of upper leaves could obviously enhance the degradation ratio in the field. The quality of flue-cured leaves of treatment C3 (close to technical maturity) of middle leaves and B4 (close to over maturity) of upper leaves was preferably than other treatment, whose degradation proportion of carotenoid during flue-curing was 64% and 68% respectively, which was at the mid to upper level of all processing.