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Thermogravimetry was used to reveal the pyrolysis differences of tobacco stems in different storage years in Henan, Hunan and Guizhou. The surface structure, pyrolysis characteristics and gaseous product composition of tobacco stems in different storage years in Henan were analyzed by electron microscopy and the IG-FTIR instrument,and the difference of kinetic parameters in each weight loss stage of stem in different years during the pyrolysis were compared and analyzed based on the Coats-Redfern method. The results showed that the effects of different storage years on the thermal weight-loss behavior of tobacco stems from Henan, Hunan and Guizhou were similar. The CPI value of tobacco stems stored for 1 year (1. 27-1. 39x10-4%-min-1--2) was higher than that of tobacco stems stored for 2 and 3 years, indicating good pyrolysis characteristics; the residual rate of tobacco stems stored for 3 years was 18. 18%-27. 45%, with poor thermal stability. While the types of pyrolysis gas products released by tobacco stems in different storage years in Henan were similar, and the maximum gas product release rate was shown as follows: tobacco stems stored for 3 years> those stored for 2 years> those stored for 1 year, and the integrity of the surface structure of tobacco stem was poor after 3 years storage, the main weight loss stages during the thermal decomposition of different storage years tobacco stem was mainly controlled by a 1. 5-order chemical reaction model. [ABSTRACT FROM AUTHOR]