Abstract:In order to understand the main components and relative contents of phytoncides in Jiufeng National Forest Park, the main components and relative contents of phytoncides of pinus massoniana forest, Liquidambar forest and tun- goiltree forest were analyzed by thermal desorption with gas chromatography-mass spectrometry（TD-GC-MS) . The re- sults showed that the highest relative content in Pinus massoniana was L-camphor（14. 68%), and the highest relative con- tent in Liquidambar forest was decanal（6. 59%), the highest relative content in tungoiltree forest is trans-squalene （9. 00%)the relative contents of terpenes in Pinus massoniana forest, Liquidambar forest and tungoiltree forest were 40. 71%,17. 72% and24. 22%, especially the content of terpenes in Pinus massoniana forest is the highest, which has a good forest therapy effect.