In order to investigate the changes of alkaloid content of cigar leaves with different maturities during air-curing,taking Shiyan No.1 as the test material,the changes of 9 alkaloids contents of cigar leaves with different maturities were studied,and the correlation analyses were carried out.The results showed that,the contents of nicotine,nornicotine,anatabine and cotinine first increased and then decreased during airing.The myosmine and 2,3′-bipyridine contents decreased first and then increased.The trend of changes in anabasine,N-methylanabasine contents was basically unchanged.In the dry tending stage,the contents of anatabine,myosmine and N-methylanabasine were the lowest in the unripe treatment,and the other alkaloids were the lowest in the ripe treatment.The nicotine conversion rate showed a upward first then downward trend in different maturity treatments during airing, and it showed overripe>unripe>ripe.Correlation analysis showed that the positive correlations were observed between nicotine,nornicotine,anatabine,anabasine and N-methylanabasine in different maturity leaves,and the ripe treatment was significantly correlated.The anatabine content was negatively correlated with myosmine but not significant.Cotinine content had a positive correlation with anatabine and β-nicotyrine contents, but was negatively correlated with N-methylanabasine content and not significant.