Abstract: To investigate the optimal collaborative aging time for cured tobacco leaves and redried strips, the effects of different aging times of cured tobacco leaves on the sensory qualities and chemical compositions of redried strips were analyzed, and the harmony of chemical compositions of tobacco leaves was evaluated with usability index. The results showed that the sensory quality and chemical composition usability index of redried strips increased first then decreased with the prolongation of aging time. In Kunming, the appropriate aging times for cured tobacco leaves and redried strips were 3-5 and 12-21 months, which were 5 and 15 months for B3F, 3 and 15 months for C3F, 3 and 12 months for X2F, respectively. After collaborative aging, the optimal usability indexes of chemical compositions in redried strips of cured tobacco leaves of B3F, C3F and X2F increased by 51.99%, 36.03% and 25.92% comparing with those without redried strip aging, respectively.