Dong quai oil, also called angelica oil is reddish brown clear oil, the main ingredients are ligustilide and linoleic acid. After isolation, three parts are obtained, include acid, phenolic, neutral parts. The acid parts are mainly palmitic acid and phthalic acid, the major components of phenolic parts are carvacrol compounds, the neutral parts include angelica ketone, n-butene phthalide lactone.