Abstract: The chemical components of the two leaf essential oils from Ligu-sticum sinense Oliv. cv. Chuanxiong Hort. collected on March 20, 1986 and April 20, 1986 resp. were analyzed by GC and GC-MS-DS of 200-202 peaks isolated by a 50m x 0.25mm i. d. bonded methyl silicone fused silica glass column from the two oils, 44 common components were identified by comparing the obtained mass spectra and retention indices with those of mass spectral data base and with retention indices determined by Jennings, W. and by authentic sample superimpositions. The relative contents of the components were calculated by LCI -100 integrator with the peak area normalization method. The experimental results showed that differences between the two oils were mainly quantitative. Ligustilide (16.62%), one of the major and physiological active components of the oil collected on April 20, was detected in minor amounts (0.36%) in the oil collected on March 20, on the other hand, γ -pathoulene ( 18.34% ) , trans-β-farnesene (8.83%) which were the main components of March oil existed in small proportion (7.79% and 1.88% resp.) in April oil.

Key words: Essential oil；Ligusticum sinense cv. Chuanxiong； Ligustilide；Sabinene

摘要： 用毛细管气相色谱和色谱-质谱-计算机联用系统对不同时期采摘的川芎叶精油化学成分进行了研究。从50m×0.25mm键合甲基硅酮弹性石英毛细管柱分离出来的202个和200处色谱峰中，初步鉴定出44个组分。其主要成分随采摘季节不同而有所不同。川芎有效成分之一-藁本内酯在早期(1986、3)采摘的叶精油叶含量只有0.36%，而在较晚(1986、4)采摘的叶精油中达16.92%。

关键词: 川芎, 精油, 藁本内酯, 桧烯