Volatile components from Platycladus orientalis are analyzed by gas chromatography with pyrolysis unit and mass spectrometry,and fifty two components were identified.The main chemical components are γ-Terpinen(4.45%),1-methyl-4-(1-methyleth)-1,4-cyclohexadiene(1.53%),trans-caryophyllene(4.19%),humulene(3.8%),α-cedrol(36.99%),acoradiene(1.48%),dioctyl phthalate(1.35%).It is a rapid and practical method for analysis of the volatile components of Chinese herbal medicine.