"Shennong materia medica classic" says: "Shennong tastes all kinds of herbs, meets 72 poisons a day, and gets tea to solve it". Tea is tea. In ancient times, the ancestors drank blood and lived a primitive life. In order to enable the people to eat safely and prevent diseases caused by improper diet, Shennong personally tasted hundreds of herbs and identified the edible nature of hundreds of herbs. In this process, Shennong discovered tea and opened up the culture of tea as medicine.