The plants of Asarum had a long centuries-old history as crude drugs in China, its volatile oil was used in the treatment of anti-inflammatory, antitussive, antalgic and so on. It was implied that methyleugenol was the effective substance for antihistamine activity in the volatile oil of Asarum. This article mainly studied the object of the chemical constituents of volatile oil in Asarum sieboldii Miq, aimed at analying chemical composition, finding the best extraction method and the optimum extraction proc...