Objective: To compare the chemical components of essential oil from different varieties (strains) of Angelica dahurica var. farmosana by GC-MS. Method: Eight varieties (strains) of A. dahurica were treated with ethanol ultrasonic. The essential oil was extracted by water steam distillation. The component of essential oil was analyzed by GC-MS. The relative percentage content was calculated by using peak area normalization method. Result: 78 compounds were identified in eight varieties (strains) A. dahurica

mainly including alcohol and alkenes. Eight varieties (strains) of A. dahurica identified 40

33

26

38

38

42

33

36 compounds

respectively. 12 compounds contained in all common compositions were accounted for over 50% of the total essential oil except B-6.Pyrazines were contained only in B-7. Conclusion: The compositions and content of essential oil are consistent in general

but there are also some differences. It provides some scientific basis for further development and utilization of A. dahurica.