The essential oil was obtained from the aerial part of Aster yomene Makino by steam distillation, samples were collected by solidphase microextraction (SPME), and the compositions of the essential oil were analyzed by gas chromatographymass spectrometry. The fragrance of the essential oil was herbal, oily, woody, earthy, smoky and spicy. There were sixtyeight constituents in the essential oil: 48 hydrocarbons, 8 alcohols, 3 ketones, 2 oxides, 2 acetates, 1 aldehyde, 1 acid, and 1 anhydride. Major constituents were germacrene D (11.56%), camphor (5.23%), caryophyllene oxide (3.38%), caryophyllene (3.18%) and germarcrene B (3.09%). By SPME extraction, thirteen constituents were identified: 12 hydrocarbons and 1 ketone. Major constituents of the SPMEextracted sample were germarcrene D (45.75%), γgurjunene (9.39%), γselinene (8.33%), camphor (4.81%) and βcaryophyllene (3.05%). Overall results suggest that the essential oil from Aster yomene a Korean weed could be used for the development of new perfumery products.