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Korean green tea leaves which were harvested three times(May, June, August) were treated with anaerobic conditions and were measured changes of y-aminobutyric acid(GABA) and other constituents. In anaerobically treated green tea leaves, the content of y-aminobutyric acid(GABA) and alanine increased while glutamic acid decreased. Whereas theanine, arginine, caffeine and tannin showed little change and the content of vitamine C slightly decreased with the passing of the anaerobic treatment time. Formation of GABA, a hypotensive constituents, was proportioned to the content of glutamic acid and the optimum time of the anaerobic treament was about 12 hours. In the anaerobic treatment of green tea leaves, effec; f nitrogen gas and vacuum condition was no difference between two.
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