Twenty-seven constituents in essential oil from the leaves of Litsea rotundifolia var. oblongifolia were identified by means of GC-MS-DS. The content of these compounds amounted to 88.75% of the essential oil. The main compounds are dodecanoic acid (43.68%), myristic acid (14.61%), n-undecanoic acid (4.70%) and palmitic acid (4.15%).