Abstract:The volatile components of Fujian Tieguanyin oolong tea and Taiwan Ruanzhi oolong tea which from different regions were extracted by fully automated headspace solid-phase microextraction （HS-SPME），and were identified by gas chromatography-mass spectrometry （GC-MS）.Then comparison of volatile components and contents by chemometrics methods between the teas was made.Results showed that a total of 71 volatile constituents were identified in seven teas，and alcohol compounds，hydrocarbon compounds，ester compounds were the major volatile components in Fujian Tieguanyin oolong tea and Taiwan Ruanzhi oolong tea，while the content of other compounds were low.The major volatile compounds of Fujian Tieguanyin oolong tea were nerolidol，indole，2-phenethyl-2-methylbutyrate，α-farnesene，phenethyl butyrate，2-phenethyl hexanoate，cis-3-hexenyl hexanoate，jasmine lactone，phytol，phenylethyl alcohol，linalool，ylangene，jasmone，etc.，while the major volatile compounds of Taiwan Ruanzhi oolong tea were geraniol，indole，linalool，nerolidol，hotrienol，α-farnesene，jasmine lactone，caffeine，jasmone，methyl jasmonate，benzeneacetonitrile，phytol，cis-3-hexenyl hexanoate，etc.Principal component analysis （PCA）and partial least squares-discriminant analysis（PLS-DA）showed that Fujian Tieguanyin oolong tea and Taiwan Ruanzhi oolong tea could be clearly distinguished according to their volatile characteristics，and found that geraniol，nerolidol，linalool，2-phenethyl-2-methylbutyrate，methyl salicylate，α-farnesene，phenylethyl alcohol，methyl jasmonate may be the key compounds which lead to differences between the oolong teas from different regions.