Abstract: To investigate the optimal parameters for leaf threshing, redrying and collaborative aging, sensory quality and the release of seven harmful components in cigarette smoke were analyzed. In addition, one-way ANOVA and canonical correlation analyses, and the variations of sensory quality of the redried leaves in tobacco-planting area of Liangshan in Sichuan were studied along with the aging time. The results showed that:1) After aging for 0-36 months, the sensory quality of B3, C3 and X3 leaf was the best in upper leaves B0-B5 (excluding those aged for 24 months), middle leaves C0-C5 (excluding those aged for 18 months) and lower leaves X0-X5 (excluding those aged for 18 and 24 months). 2) There was no significant correlation between the releases of NNK, crotonaldehyde, benzoapyrene, HCN, ammonia and the drying temperature of tobacco leaves out of first moistening and the temperature of each drying section (from 1st to 4th sections). 3) The order of the seven harmful component releases for the treated leaves were:for NNK, B2F > X2F, C3F; for phenol, B2F > C3F > X2F; for crotonaldehyde, no obvious among difference B2F, C3F, X2F; for CO, B2F > X2F > C3F; for benzoapyrene, B2F > C3F, X2F; for HCN, B2F > C3F, X2F; for ammonia, B2F > C3F, X2F. 4) The sensory quality of leaves deteriorated first and then improved with the aging time, and the optimal aging time was 12 months. After aging for 12 months, the scores in sensory quality for B3, C3 and X3 increased by five, two and four points comparing with the leaves (B0, C0, X0) processed under original conditions, respectively.