A variety of biologically active ingredients in tea have a preventive effect on various human diseases.Dark tea belongs to one kind of tea and has all the biochemical characteristics of other teas.Because dark tea is different from other teas in terms of raw material selection and processing technology,its composition and proportion of biochemical components have certain special characteristics.With the increasing incidence of cancer in the world,the research on the anticancer effect of dark tea has become an important issue.In this paper,the effects of tea polysaccharides,tea polyphenols,theo...