Abstract: The chemical constituents of the essential oil of Cinnamomum longepaniculatum leaf were analyzed by the GC-MS-DS technique the linear programmed retention index and the superimposition of authentic samples. Among 49 constil tuents seperated, 28 constituents were identified. The major constituents are 1,8-cineole(58.55%), 2-terpineol (15.43%), and sabinene (14.16%) etc.