OBJECTIVE To analysis and compare the essential oil components in Oenanthejavaaica (BI.)DC.from 8 different origin of Hunan. METHODS Essential oil was extracted by steam distillation and its chemical composition was analyzed by gas chromatography-mass spectrometry(GC-MS). RESULTS The main components of essential oil in different producing areas are quite different,and the characteristic components with the highest content are different from place to place.A total of 63 compounds were identified from essential oil samples of different origins,of which there were 8 compounds between the samples....