Abstract: In order to find out the relationships of main chemical components in Qujing tobacco with the altitude,latitude and longitude of growing areas,the canonical correlation analysis of total sugar,reducing sugar,total nitrogen,nicotine,potassium,chlorine in tobacco with altitude,latitude and longitude of their growing areas was conducted,2100 flue-cured tobacco samples were analyzed.The results indicated that:for the leaves from the same stalk position all the 3 pairs of canonical correlation coefficients reached 1% confidence levels;main chemical components in leaves from different stalk positions had similar relationships with altitude,latitude and longitude;total sugar positively correlated with altitude and latitude,negatively correlated with longitude;the correlations of total nitrogen with altitude and longitude were positive,with the latitude were negative;potassium negatively correlated with altitude and latitude, positively correlated with longitude;chlorine negatively correlated with altitude,latitude and longitude;the correlations of reducing sugar and nicotine with