The recent research achievements about the mechanisms of beneficial health effects of tea polyphenols and the epidemiological investigation on anti-cancer,anti-cardiovascular diseases,and anti-obesity through tea consumption were reviewed.It is proved that reactive oxygen species is the main reason to induce cell mutation,DNA damage,obesity,high blood pressure and many kinds of cancers.Tea catechins and theaflavins have excellent bioactivity on scavenging ROS due to their characteristic structure feature of phenolic hydroxyl group,which means drinking tea could prevent diseases.Epidemidogical investigations also showed that tea consumption could reduce the risk of lung cancer,gastric cancer,bladder cancer,and so on.However,the frequency of tea drinking or tea consumption amounts significantly affected the prevention efficiency.The epidemiologic investigations also find that drink green tea,especial black tea is useful to modify the cardiovascular diseases.In vivo and vitro tests showed that tea supplement could moderate the metabolism of blood lipid and prevent obesity.These indicated that tea and tea extracts might reduce the risk of many diseases. The recent research achievements about the mechanisms of beneficial health effects of tea polyphenols and the epidemiological investigation on anti-cancer, anti-cardiovascular diseases, and anti-obesity through tea consumption were reviewed. It is proved that reactive oxygen species is the main reason to induce cell mutation, DNA damage, obesity, high blood pressure and many kinds of cancers. TEA catechins and theaflavins have excellent bioactivity on scavenging ROS due to their characteristic structure feature of phenolic hydroxyl group, which means drinking tea could prevent diseases. Epidemidogicalloring also showed that tea consumption could reduce the risk of lung cancer, gastric cancer, bladder cancer, and so on.However, the frequency of tea drinking or tea consumption decreased significantly affected the prevention efficiency. epidemiologic investigations also find that drink green tea, especial black tea is useful to modify the cardiovascular diseases.In vivo and in vitro tests showed that tea supplement could moderate the metabolism of blood lipid and prevent obesity. these said that tea and tea extracts might reduce the risk of many diseases.