Abstract: Identifying the Two Kinds of Angelica Tuhuo by GC/MSZhang Shibin;Li Huamin (Analytical and Testing Center,Beijing Normal University, Beijing 100875, China) Abstract:A new method for identifying the two kinds of Angelica Tuhuo is reported. The conditions of steam distillation and GC/MS,the components of volatile oils of the two kinds of Tuhuo are described. Keywords:Angelica Tuhuo,volatile oil,GC/MS