Abstract: The primary chemical components of flue-cured tobacco in Qianjiang, Xioushan, Pengshui, Fengdu, Nanchuan, Shizhu, Fuling, Wuxi of Chongqing Area was determined, and factor analysis was carried out on primary chemical components, in addition, regression analysis was carried out between primary chemical components and smoking quality. Four main factors were selected from 10 primary chemical components and derivative components, which were carbon nitrogen factor, potassium ion factor, chloride ion factor and starch factor. Accumulative contribution rate of 4 main factors was 89.765%, among which carbon nitrogen factor accounted for 41.80% of original variable total variance, and was significantly higher than other three factors, which indicated that carbon nitrogen factor played the most important role in primary chemical components and showed the greatest impact on tobacco quality. The regression analysis between chemical components and smoking quality showed that starch, sugar alkali rate, reducing sugar and total sugar were main factors that affected smoking quality. Reducing sugar was positively correlated with smoking quality, and total sugar, sugar alkali rate, starch were negatively correlated with smoking quality. Potassium ion, chlorine ion and potassium chlorine rate insignificantly affected smoking quality．

Key words: flue-cured tobacco, chemical components, smoking quality, factor analysis, regression analysis