Essential oil of the root of Angelica dahurica Benth et Hook(Umbelliferae) was investigated. Essential oil was obtained from the dried roots by steam distillation and fractionated by column chromatography. Each isolate or fraction was identified by GC, GC-MS and spectral analysis. It was found to contain eleven monoterpenes such as ${alpha}-pinene(4.74%),;campben, {eta}-pinene,;myrcene,;{alpha}-phellandrene,;{delta}-3-carene(39.4%),;{alpha}-terpinene,;{ ho}-cymene,;{eta}-phellandrene,;{alpha}-terpinene,;terpinolene;and;also;found;to;contain;4-vinylguaiacol,;iso-elemicin,;{eta}-elemene$, caryophyllene, ligustilide, osthol and seven tentatively identified sesquiterpenes.