Abstract: The biochemical quality of Shi Qian Tai tea from Guizhou was studied， including contents of polyphenols， amino acids， caffeine， soluble sugar and vitamin C. The composition of the biochemical components in Shi Qian Tai tea fresh leaves and dry tea were analyzed in comparison with Fuding white tea. The results showed that the content of amino acids， caffeine， vitamin C and soluble sugar in Shi Qian Tai tea were significantly higher than Fuding white tea. The content of caffeine， soluble sugar， polyphenols and vitamin C in sample point B were higher than sample point A and C， and the highest vitamin C content in sample point A was as high as 1.13%. The content of polyphenols in Shi Qian Tai dry tea was lower than Fuding white tea， but the content of caffeine， water extracts and vitamin C were significantly higher .

Key words: Shi Qian Tai tea, biochemical quality, fresh leaves, dry tea