Abstract: To investigate the chemical components and release characteristics of aerosol heated tobacco products (aHTPs), the main chemical components in the tobacco filler and e-liquid and the aerosol releases were studied for two selected aHTPs (coded as samples A and B). The results showed that: 1) Nicotine was detected only in the tobacco filler with the mass fractions ranging from 11.04 to 20.21 mg/g of tobacco. 2) The mass fractions and proportions of aerosol agents (1, 2-propanediol and glycerin) in the tobacco filler and e-liquid of the same brand aHTP sample were different, and the mass fractions of 1, 2-propanediol and glycerin were significantly higher in the e-liquid than in the tobacco filler. 3) In the aerosol of the e-cigarette-like sample A, nicotine release gradually decreased per 10 puffs, the releases of 1, 2-propanediol and glycerin reached the maximum around the 30th puff. The aerosol of eHTP-like sample B was compared to an eHTP, and it was found that nicotine and moisture releases were comparable to those of eHTPs, the releases of 1, 2-propanediol and glycerin in aerosol from sample B were much higher than those from eHTPs. 4) When normalized to per volume unit aerosol, the nicotine releases from samples A and B were lower than that from eHTP sample iQOS (a centrally heating type) but higher than eHTP sample glo (a peripherally heating type), while the releases of 1, 2-propanediol and glycerin were significantly higher than those of eHTPs. These results suggest that aHTP may be designed to compensate for the insufficient aerosol amount of an eHTP.