Abstract: For producing flue-cured tobacco seedlings at the areas of low temperature and less sunshine, closed seedling producing technique was studied with a self-configured closed seedling production system for flue-cured tobacco, the working principle of the system was introduced and its specifications and parameters were determined. The results of experiments showed that it only needed 22 days for cultivating seedlings of 4.5 leaf age with this technique, which was 24 days shorter than that with a greenhouse floating seedling system; the stalk circumference of seedling, the dry weight of leaf, stalk and root, root-shoot ratio, and vigorous seedling index increased by 35.29%, 8.48%, 49.23%, 160.00%, 74.22% and 83.78%, respectively; moreover, the costs of direct and heeled-in transplanting of the seedlings from closed system reduced by 101.3 and 30.4 RMB yuan per 667 m², respectively. Closed seedling producing technique effectively solved the problems of longer seedling age and lower vigorous seedling ratio at areas of low temperature and less sunshine, it reduced the consumption of non-renewable peat resource and more significantly the cost of seedling production.