According to Shennong's herbal classics, Shennong tasted a hundred herbs every day, and when he was poisoned by 70, he was relieved by tea. Tea is an ancient word for tea (English tea is pronounced from tea). The earliest function of tea is medicine.

In the third year of Tang Dynasty (850), a monk 130 years old. Tang Xuanzong asked him what medicine he had taken to live so long. The monk replied, "I never knew its medicinal properties." I only love tea all my life. Whenever I travel to a place, I can't have too many cups of tea at first. " The emperor gave the monk fifty catties of good tea.

Lian's health classic "Eight Notes on Respect for Life" wrote: "People who drink real tea can quench their thirst and digestion, reduce phlegm and sleep less, benefit waterways, improve their thinking, and relieve boredom. People can't live without tea for a day. "