Lepidium meyenii Walpers (MACA), as famous supplement plant source in Cordilleras of South America , have been successfully carried out to be large-scale cultivated in Lijiang of Yunnan province of CHINA.This paper reported.that the differences of the main compounds of essential oils by steam distillation extraction , Petroleum ether leaching , and Ether extraction from Lepidium meyenii Walpers cultivated in Lijiang of Yunnan Province, and Ninety chemical components were analyzed and identified by gas chromatography/mass spectrometry (GC/MS). The Study results showed that the main compounds of essential oils by Petroleum ether leaching is 1,1-dimethylethoxy)methyl]- Benzene (26.00%)，N-(phenylmethyl)- Acetamide(23.47%)，Phthalic acid, hexyl octyl ester(23.49%); and that of steam distillation extraction is 1-isocyano-2-methyl- Benzene(81.80%), that of Ether extraction from steam essential oil of Lepidium meyenii Walpers cultivated in Lijiang is Benzyl nitrile (56.29%) .