Abstract: Based on the test of moisture absorption、moisture desorption equilibrium moisture content, as well as analysis of petrolum ether extract chemical indicators to eighty kinds of domestic and foreign cut tobacco, simple correlation analysis and canonical correlation analysis were used respectably to study the relationship between petrolum ether extract and moisture retention.The experiment results show: the content of petroleum ether extract in different stalk positions cut tobacco: upper>middle>bottom, the content of petroleum ether extract in different type cut tobacco: burley tobacco> oriental tobacco> flue-cured tobacco> red sun-cured tobacco, the content of cut tobacco petroleum ether extract are negatively related to moisture absorption、moisture desorption equilibrium moisture content in tobacco