Abstract: In order to analyze the effects of main chemical component contents on the moderate aroma characteristic of flue-cured tobacco leaves, the correlation and path analysis were carried out by using different tobacco leaves from different producing areas. Correlation analysis results showed that the moderate aroma characteristic had significantly or highly significantly positive correlation with nicotine and K/Cl, and negative correlation with the ratio of reducing sugar to total sugar, the ratio of total nitrogen to nicotine, the ratio of reducing sugar to nicotine, protein and Cl. Path analysis results showed that the moderate aroma characteristic was affected directly by nicotine, total nitrogen, Cl, protein and the ratio of reducing sugar to nicotine, and affected indirectly by the ratio of reducing sugar to total sugar. However, the ratio of total nitrogen to nicotine and K/Cl were with more indirect effects than direct effects on the moderate aroma characteristic.