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The process of cigarette combustion was very complicated, in which pyrolysis was extremely important.Research on pyrolysis behavior of tobacco sheet could improve the level of cigarette formulation, perfuming, feeding and reduce the harmful components in flue gas.Through establishing online method of pyrolysis-gas chromatography mass spectrometry, we simulated the burning process of tobacco sheet.Samples were crushed to online pyrolysis.After the analysis of gas chromatography-mass spectrometry, the data was processed by PLS-DA and 74 compounds were identified.