Abstract: In order to investigate the temporal dynamic characteristics of chemical components and relative contents of phytoncide, five types of forest stands, Cupressus funebris, Pinus massoniana, Cryptomeria fortune, Cinnamomum septentrionale and Pleioblastus amarus were chosen as the research object in Sichuan province. And the VOCs from the five forest stands were sampled in February, May, August, November in 2018. Then the chemical components and their relative content in the VOCs were analyzed by gas chromatography-mass spectrometry (GC/MS). The results showed that (1) endogenous terpenes and exogenous alkanes were the main components of VOCs in the forest stands; (2) eucalyptus oleoresin and (+)-Dipentene were the main components of phytoncide in all samples, and other terpenes were occasionally detected; (3) the relative content of phytoncide increased at first and then decreased, with the highest in May and August; (4) the relative content of phytoncide in the Cupressus funebris stand was significantly lower than that in other forest stands in May and August; (5) the relative content of phytoncide in the Cryptomeria fortune stand was significantly higher than that in other forest stands in November.