The whole fermented tea is fermented and baked. The polyphenols undergo enzymatic oxidation reaction under the action of oxidase, and the content is reduced, and the irritation to the stomach is reduced. In addition, the oxidation products of these tea polyphenols can also promote digestion of the human body, so black tea not only does not hurt the stomach, but can nourish the stomach. Regular consumption of sugar-added black tea and black tea with milk can reduce inflammation and protect the gastric mucosa, and it also has a certain effect on the treatment of ulcers.