Abstract: In this study the volatile compositions in root,stem and leaf of Rabdosia excise (Maxim.) Hera were determined by gas purge micro-extraction techniques.The contents were analyzed by gas chromatography-mas spectrum (GC-MS).The qualitative of volatile components was completed by comparison with the standard spectrum library,and the relative content of each compound was calculated using the area normalization.The 149 peaks were detected in Rabdosia excise,comparison with the standard spectrum library,80,85 and 79 components were identified in root,stem and leaf,which accounted for 93.66%,88.05% and 72.62% of the total peaks in each part.The volatile components of root,stem and leaf for Rabdosia excise were compared by chemical method and principal component analysis.The results showed that the chemical compositions and relative contents were different to some extent for the volatile components in root,stem and leaf.This study provides reference basis for development and utilization of Rabdosia excise.

Key words: Rabdosia excisa, volatile components, different parts, gas purge microextraction method (GP-ME), principal component analysis (PCA)