Abstract: To reveal the characteristics of pyrolysis and smoke release from tobacco section of heated tobacco products, tobacco granules were prepared via wet granulation. The effects of tobacco types on pyrolysis and smoke release of the tobacco granules were studied with thermogravimetric-Fourier transform infrared (TG-FTIR) and cone calorimeter (CONE). The results showed that: 1) The weight loss of the tobacco granules prepared from different tobacco materials were similar. Comparing to the tobacco granules prepared from flue-cured tobacco, the highest weight loss rate temperature of those prepared from tobacco stems, reconstituted tobacco, burley, cigar and oriental tobacco shifted towards lower temperature region. The weight loss rates of volatile compounds released from the tobacco granules prepared from tobacco stems and reconstituted tobacco were higher at the weight loss stage. During this stage, the proportion of the weight loss from flue-cured tobacco was the largest with the lowest amount of solid residues after pyrolysis. 2) The FTIR spectra indicated that the release of gaseous products from the tobacco granules prepared from different tobacco materials were almost the same, while the release temperature ranges were slightly different due to the differences of chemical components. The temperature ranges at which carbohydrates, phenols, alcohols and other hydroxyl-containing compounds released mainly concentrated in the range of 150-300 ℃. The releases of carbonyls, esters compounds and CO could be divided into two stages: 250-400 ℃ and around 500 ℃. NH₃ and CH₄ were released at temperatures higher than 500 ℃. 3) The bulk densities of the tobacco granules prepared from tobacco stems, reconstituted tobacco and cigar tobacco ranged from 0.54 to 0.56 g/cm³; they had higher smoke release rates and higher total smoke release amount although their bulk densities were lower than those made from other tobacco materials. Tobacco granules prepared from tobacco stems had the highest initial smoke release rate. Moreover, the releases of CO and CO₂ showed a similar trend to that of smoke release rate, i.e., the higher the smoke release rate, the higher the CO and CO₂ release rates would be.