Abstract:The quality of Huangjinya and Baiye No.1，the main tea varieties introduced in Weng’an county，Guizhou Province，was examined.Taking Fuding Dabai in the same area as the control，green tea samples were prepared from the new shoots of one-bud two-leaf plants during different periods in spring.The polyphenol，caffeine，total free amino acid，total catechin，and soluble sugar contents of the water extracts were then determined.According to the results，the soluble sugar content of golden bud was higher than that of the other two varieties in spring，ranging from （3.59±0.13）% to （4.83±0.08）% .The total amount of free amino acids in Baiye No.1 increased at first and then decreased，reaching a maximum of（8.31±0.22）% on 16 March 2022，which was significantly higher than that of the other varieties.The total polyphenol，caffeine，and catechin contents of Fuding Dabai were（18.25±0.51）% ～（20.17±1.19）% ，（3.76±0.08）% ～（4.55±0.11）% ，and （14.96±0.31）% ～（16.02±0.23）% ，respectively，being higher than those of the other two varieties.The three tea cultivars had a high content of the water extract ranged from（40.08±0.97）% to（45.22±1.60）% .Overall，compared with Fuding Dabai，Baiye No.1 and Huangjinya had higher contents of total free amino acids and lower amounts of tea polyphenols.The phenol-to-ammonia ratios of the three varieties ranged from（1.99±0.06）to（5.00±0.20），all less than 8.In summary，the water extracts of green teas produced from the three main imported tea varieties in Weng'an county have high total free amino acid and low phenol-to-ammonia ratios，verifying them to be of excellent quality.