Abstract: The pyrolysis and combustion behaviors of cut tobacco in air were studied with thermal analyzer and fast pipe type heating furnace. The release of acidic, neutral and basic aroma components and tar were determined at different temperatures. The results showed that tar and most of aroma components were released before temperature rising to 350℃. Further temperature rising did not contribute much to the release of tar, but the release of different aroma components would keep increasing or decreasing trends in their degrees.