| Natural aging of tobacco was an important part of cigarette production, which plays an important role in the improvement of cigarette quality and the control of the cost. Tobacco aging and warehouse management had changed greatly with the wide use of tobacco threshing and redrying and blending module. In this paper we took blending module from different tobacco growing-areas as materials, which can reveal the changing regularity of tobacco appearance quality, sensory quality, chemical components, aroma components and enzymes activity in the process of aging. The study of aging regularity and suitable aging period of blending module quality of different tobacco growing-areas under the climate of Wuhan can provide basis and technical support for cigarette industrial enterprise for their warehouse management and tobacco conservation. The results indicated that:1. With the extending of aging time the content of total sugar, reducing sugar, pH, nicotine and volatile base was gradually decreased. While the content of iodine value and volatile acid increased. The decreasing extent of total sugar content in different tobacco growing-areas was different, the middle-leaves and upper-leaves in Hubei with a larger decreasing extent of 15.5% and 9.1%, and for lower-leaves, Sichuan had a larger decreasing extent of 27.6%, for upper-leaves, Dongbei had the smallest decreasing extent of 10.2%. The decreasing extent of reducing sugar showed that: the decreasing extent of upper-leaves in Hubei was larger (25.9%), and Yunnan was smaller (6.2%). The middle-leaves in Yunnan was larger (16.1%), and Sichuan was smaller (6.3%). The lower-leaves in Sichuan was larger (25.2%), and Dongbei was smaller (13.0%). The content of nicotine had a trend of decrease but higher volatility. As for volatile base, the decreasing extent of upper-leaves in Sichuan was larger (21.62%), the middle-leaves in Hubei was larger (25.71%), and Guizhou was smaller (2.86%), the lower-leaves in Dongbei was larger (44.44%), Hubei was smaller (14.29%). As for pH, the decreasing extent of upper-leaves was Dongbei (10.2%)>Yunnan (9.8%)>Sichuan(8.7%)>Hubei(8.3%)>Fujian(7.6%). The middle-leaves was Dongbei(9.2%) > Guizhou(8.6%) > Sichuan(6.6%) > Yunnan(6.4%) >Fujian(5.7%)>Hubei(5.65). The lower-leaves was Sichuan(8%)>Fujian(7%)>Hubei(6.7%)>Dongbei(6.2%)>Yunnan(6%). As for volatile acid, the increasing extent of upper-leaves in Fujian was larger (116.85%), and Yunnan was smaller (85.71%). The middle-leaves in Yunnan was larger (115.38%), Dongbei was smaller (96.97%).The content of iodine value in these growing-areas was gradually increased during aging, the increasing extent of iodine value was small before 18 months, but after 18 months it was suddenly increased. As for the increasing extent of iodine value, the upper-leaves in Dongbei and Yunnan had a larger extent of 78.91% and 71.04%, the middle-leaves had a larger extent of 90.72% in Dongbei, the lower-leaves had a larger extent of 68.34% in Sichuan. The changing trend and content of iodine value showed that: the iodine value was small at the start of aging, and it determined the aging level was low. The iodine value changed greatly after 18 months, so the aging level changed significantly. It was a turning point of tobacco quality after aging 18 months, and the quality of tobacco leaves gradually entered the appropriate aging period, the usability of blending module was higher.2. The content of aromatic amino acid in different tobacco growing-areas was gradually increased, as for the increasing extent, Yunnan (97%)>Guizhou (97%)>Sichuan (65%)>Dongbei (53%)>Hubei (41%)>Fujian (37%). The content of maillard reaction products had a trend of increase, the increasing extent was Sichuan (215%)>Yunnan (195%)>Guizhou (180%)>Hubei (165%)>Dongbei (160%)>Fujian (86%). The content of degradation products of carotenoids had a trend of increase during aging, and the final content was Fujian (119.61 ug/g) >Hubei (114.23 ug/g) >Guizhou (109.24 ug/g) >Yunnan (97.28 ug/g) >Sichuan (92.73 ug/g) >Dongbei (72.91 ug/g). As for the increasing extent, Dongbei (97%)> Sichuan (86%)>Guizhou (85%)>Hubei (82%)>Yunnan (80%)>Fujian (67%). The content of degradation products of cemdrenoid had a trend of first increased and then decreased, the content was highest when aging 18 months, and the increasing extent was Dongbei (51%)>Guizhou (31%)>Fujian (25%)>Sichuan (21%)>Yunnan (19%)>Hubei (19%). The degradation products of chlorophyll had a trend of decrease during aging, Fujian had a higher content of 564.29 ug/g, while Dongbei had a lower content of 366.41 ug/g. The decreasing extent was Dongbei (27.2%)>Yunnan (18.2%)>Sichuan (17.1%)>Guizhou(16.9%)= Fujian (16.9%)>Hubei (15.1%). 3. The activity of correlation enzymes had a close relationship with tobacco sensory quality and aging speed, enzyme activity of different growing-areas had great discrepancy, but one thing in common was when the aging time were 21 months, all enzyme activity had come to the level of inactivation. The activity of polyphenol oxidase in the 6 tobacco growing-areas had a trend of decrease during aging, the activity in Yunnan was larger, the next was Guizhou, Sichuan, Hubei, Dongbei and Fujian tobacco growing-areas. The activity of diastase had a trend of first increased and then decreased, and the order was Yunnan>Dongbei>Hubei>Fujian>Sichuan>Guizhou. The activity of phenylalanine ammonia-lyase had a trend of decrease during aging, and the activity in Fujian was larger, Dongbei and Guizhong had a lower phenylalanine ammonia-lyase activity.4. The color of blending module in different growing-areas deepened with the aging time extending, among them, Fujian and Hubei were deeper, and the color of Dongbei area was lighter. The chroma first improved and then became worse with the extending of aging time, Yunnan, Sichuan and Guizhou had better chroma. Leaf structure became lossen as the aging time increased, in Fujian the leaf structure had changed dramatically after aging and obviously better than the rest areas. Oil contents first increased and then decreased with the aging time increase, among them the blending module of Yunnan, Sichuan and Guizhou had better oil contents. The luster of tobacco leaves had a trend of gradually weakening, the tobacco leaves from Yunnan and Dongbei had a better luster.5. The sensory quality of blending module in different growing-areas during aging first increased then decreased. The needed aging time of blending module in different growing-areas came to it`s best sensory quality was: the lower-leaves of Yunnan need 19 months, middle-leaves need 20 months, and upper-leaves needed 23 months. The lower-leaves of Sichuan needed 19 months, middle-leaves needed 21 months, and upper-leaves needed 22 months. The lower-leaves of Hubei needed 18 months, middle-leaves needed 20 months, and upper-leaves needed 21 months. The middle-leaves of Guizhou needed 20 months. The lower-leaves of Dongbei needed 23 months, middle-leaves needed 24 months, and upper-leaves needed 25 months. So the aging speed of tobacco leaves in different stalk positions and growing-areas showed that: lower-leaves>middle-leaves>upper-leaves, Fujian>Hubei>Yunnan>Sichuan>Guizhou>Dongbei.
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