Abstract:The volatile oils of Eugenia caryophyllata Thunb.were extracted from buds，fruits，leaves，and branches by steam distillation.Their chemical compositions were identified by gas chromatography-mass spectrometry（GC-MS），and antioxidant activities were investigated.The results showed that eugenol，acetyleugenol，andβ-caryophyllene served as the main components of the four parts of E.caryophyllata.The IC50values of volatile oils from buds，fruits，leaves，and branches on DPPH·were（37.35±0.82），（98.18±0.50），（21.37±0.32）μg/mL，and（28.14±0.46）μg/mL，respectively，while the IC50values on ABTS+·were（139.48±0.76），（244.99±1.21），（117.32±0.63）μg/mL，and（141.61±0.84）μg/mL，respectively.Additionally，as revealed by reducing power and ferric ion reducing antioxidant power（FRAP）assays，the value in the leaves was the highest，followed by those in the buds and branches，and that in the fruits was the lowest.