Abstract: To study the transfer behaviors of heterocyclic flavors in electrically heated tobacco products, the distributions of eight single heterocyclic flavors in tobacco section, cooling section, filter and total particulate matter (TPM) of mainstream aerosol of electrically heated tobacco products before and after smoking were analyzed by GC. The results showed that: 1) The retention rates of the tobacco section to the eight single heterocyclic flavors were in the range of 8.68%-69.30%, their loss rates in air were 24.96%-71.50%, their residual rates in the tobacco section were 5.21%-27.13%, their retention rates by the filter ranged from 8.27% to 22.72%, and their transfer rates to aerosol were 6.16%-28.49%. Their puff-by-puff transfer rates to the aerosol of heated tobacco products increased first and then decreased with the increase of puff number. 2) The transfer rates of 2-acetylpyrazine and 2-acetylpyridine to aerosol were more than 25%. 3) The boiling points of the flavors extremely significantly positively correlated to their retention rates by tobacco section, their residual rates in the tobacco section, their retention rates by filter and their transfer rates to the aerosol. 4) For homologous heterocyclic flavors with different ring structures, their retention rates by the tobacco section, their transfer rates to aerosol TPM and their puff-by-puff transfer rates in the aerosol increased gradually, and their transfer rates and loss rates in air decreased gradually with the increase of side chains' number and the enhancement of structural stability.