Abstract:The compositions of the essential oil from the leaves of Callicarpa formosana Rolfe in Guangdong Province were analyzed by means of GC-MS technique, and 48 chemical constituents, accounting for 90.14% of total content were identified. The main components were (-)-spathulenol (20.23%), β-caryophyllene (17.22%), germacrene D (8.06%) and β-eudesmene (5.52％). Besides, some sesquiterpenes and their oxides, such as t-elemene (4.18%), aristolene (3.78％), isoaromadendrene oxide (2.71%) and 4-terpineol (2.50%) had also relatively high contents. The tested oils at three concentrations displayed ability to scavenge the stable free radical DPPH and showed a concentration-effect relationship.