Abstract: The essential oils of the Eupatorium fortunei Turcz. were extracted by simultaneous distillation extraction. The chemical components were separated and analyzed by gas chromatography-mass spectrometry. The content of essential oils extracted from Eupatorium fortunei Turcz. was 2.73%. The identification of the volatile compounds was confirmed by comparing the retention indices with standard values of authentic samples. The relative content was calculated from the peak area normal-ization method. The results indicated that there are thirty-three volatile compounds identified in Eupatorium fortunei Turcz. The major chemical components from Eupatorium fortunei Turcz. are: 2H-1-benzopyran-2-one(12.58%), thymol (4.38%),2,4,5,6,7, 8-hexahydro-1,4,9,9-tetramathyl-3H-3a,7-methanoazulene(4.50%), caryophlleneoxidase(5.27%), 1-methyl-4-(1-methylethyl)-phenol(3.97%) and 1,1a,4,5,6,7,7b-octahydro-1,1,7, 7a-tetramethyl-2H-cyclopropa[a]naphtha (3.62%).

Key words: Eupatorium fortunei Turcz, essential oils, simultaneous distillation extraction, gas chromatography-mass spectrometry, peak area normalization method