Abstract: The chemical compositions of volatile oils from wild papillose epipactis were extracted by water stream distillation, analyzed by GC-MS and calculated by chromatographic peak area normalization method. Seventy-two chemical compounds were identified,which takes up to 92.42% of the total oil. The main compounds are 3-butyl-6, 7-two-H-pentane [b] pyridine-amine (13.114%), 21 Alkane (8.148%), isopropyl alcohol (6.663%), dibutyl phthalate butyl ester (5.008%), 1-octanol ( 3.957%), etc. The determination of these chemical constituents in this wild flower will provide scientific basis for further exploitation of papillose epipactis in Yunnan.

Key words: papillose epipactis, volatile oil, GC-MS