Abstract:ObjectiveTo analyse volatile constituents of Herba Artemisiae Annuae and its preparation(Shuangqing Yanhou tablet).MethodsThe constituents separated were identified by GCMS,and the percentage contents of compositions were determined by normalization method.Results44 components were separated and identified in volatile oil from Herba Artemisiae Annuae,and 46 components were separated and identified in Shuangqing Yanhou tablet.ConclusionThe method is stable,reliable and suitable for the volatile constituent analysis of traditional Chinese medicine.