Abstract: In order to investigate the characteristics of heat-not-burn tobacco products, two heat-not-burn products, A and B, were analyzed in terms of cigarette structure, tobacco material and the release and composition of tobacco smoke. The results showed that:1) Both A and B tobacco rods consisted of three main parts, namely a heat source, a smoke generation section and a smoke condensation unit. 2) The smoke generating tobacco material in the two products was reconstituted tobacco with considerable glycerol. The total nicotine content in reconstituted tobacco was much lower than that in tobacco leaves for traditional cigarettes, and the form of nicotine was free base nicotine. The reconstituted tobacco in the smoke condensation unit of product A was flavored more than that in the smoke generation section. Various phenolic flavors with smoky aroma note were added in the reconstituted tobacco of product B. 3) The highest heating temperature of product A was above 500℃, which caused the combustion of a part of the reconstituted tobacco. However, the heating temperature of product B was about 300℃, which was below the ignition point of the reconstituted tobacco. 4) The tar delivery of the two products was significantly lower than that of traditional cigarettes. Large amounts of glycerol esters were detected in the smoke of product A. The contents of moisture and pyrolysis components of saccharide were higher in the smoke of product B.