Abstract:The study explored the content of mineral elements and biochemical indicators in various teas in Northern Guizhou Province，to provide reference data for the quality evaluation of teas in this region.A combination of local market random sampling and laboratory analysis was used.The ranges in concentrations of ele ments was 1.69g/kg to 3.86g/kg for calcium（Ca），1.08g/kg to 2.06g/kg for magnesium（Mg），0.52g/kg to 1.19g/kg for manganese（Mn），67.04 mg/kg to 123.35 mg/kg for iron（Fe），25.65 mg/kg to 62.74 mg/kg for zinc（Zn），and 2.83 mg/kg to 8.18 mg/kg for strontium （Sr），and 0.05 mg/kg to 0.14 mg/kg for selenium.The content of tea polyphenols was 23.57%-43.24%，with an average of 32.41%.Green tea had a higher theanine content（1.06%-2.05%，average 1.63%）than black tea.Green tea was higher than black tea.Ca and Sr were significantly positively correlated，Mg was significantly positively correlated with Fe and Zn，Mn was significantly negatively correlated with tea polyphenols，and Mn was significantly negatively correlated with theanine.There was a significant negative correlation between theanine and Ca and Sr.Trace elements were enriched and the coefficient of variation was large，indicated that Mn had an antagonistic effect on the formation of theanine and tea polyphenols.Ca and Sr were found to inhibit the formation of theanine.Mintan black tea，Fenggang green tea，and Daozhen green tea had higher phenolic ammonia and the tea soup was more bitter.The content of polyphenols in Mintan green tea and Daozhen black tea was more suitable.It did not affect the taste of the tea soup.