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The moisture content of cigarette tobacco directly affects the smoking quality and storage period of cigarettes. The influence of the sealing property of cigarette packets on the moisture of the cigarette was studied, and a solution to improve the sealing property of the small package was provided. At the same time, the standard boundary for judging the packaging tightness of cigarette packets is calculated. Under different temperature and humidity environment, the air flow rate of the same packing box is higher than that of the 30-40mL/min interval. Improvement measures were applied to determine the packing seal value index of soft package cigarettes under certain conditions