Abstract: Study of Space Environmental Influence on the Active Constituents of the Essential Oil from Agastache Rugosa by GC/MSZhao Shuping; Xue Lan; Zhao Liqian; Lin Lin(Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100094, China)Li Xianggao; Qi Zhangnian; Chen Mei(Institute of Space Medico-Engineering, Beijing 100094,China)Abstract: The essential oils of Agastache rugosa with two groups,satellite group and gound control group,were analysed by GC/MS. 41 chemical constituents were determined. Estragole, pulegone and menthone are major components. Estragole is 58%, pulegone is 12% and menthone is 17% in the satellite group. Estragole is 43%,pulegone is 35% and menthone is 10% in the gound control group. Keywords: space environment; simulated experiment; essential oil