Tusu is a grass name. Some people say that Tusu is a kind of house in ancient times. Because the wine is brewed in this kind of house, it is called Tusu wine. It is said that Tusu wine was created by Hua Tuo, a famous doctor in the late Han Dynasty. Its formula is made by soaking traditional Chinese medicines such as rhubarb, atractylodes, cinnamon twigs, fang, pepper, aconite, and aconite into wine. This medicine has the effects of replenishing temperature and yang, dispelling wind and cold, and avoiding evils caused by epidemic diseases. It was later spread by Sun Simiao, a famous doctor in the Tang Dynasty. Every year during the twelfth lunar month, Sun Simiao always distributed a packet of medicine to his neighbors and told everyone that they could make wine with the medicine and drink it on New Year's Eve to prevent the plague. Sun Simiao also named his house "Tusu House". Later, passed down from generation to generation, drinking Tusu wine became a New Year custom. In ancient times, the way to drink Tusu wine was very unique. Most people always start drinking from the oldest ones; but when drinking Tusu wine, it is just the opposite, starting from the youngest ones. That is to say, when the whole family gets together to drink Tusu wine, the younger ones start first, followed by the older ones, and each person drinks a little bit. The Song Dynasty writer Su Che's poem "Chu Ri" said: "I drink Tusu at the end of the year, and I am more than seventy years old before I know it." This is the custom. Some people don't understand the meaning of this habit. Dong Xun explained: "The younger ones get older, so they are celebrated; the older ones lose their years, so they are punished." This custom was still very popular in the Song Dynasty. The poem "Outside" said: "But if you are poor and sad, you will grow strong, and you will drink Tusu wine in the end." Although Su Shi was poor in his later years, his spirit was very optimistic. He believed that as long as he was healthy, he did not care even if he was old, so he drank Tusu wine as a penalty in the end. Of course there is no need to refuse. This unique drinking order often made people feel all kinds of emotions in ancient times, so it left a deep impression on people. Until the Qing Dynasty, this custom still persisted. Although this custom is no longer popular among people today, the custom of drinking these medicinal wines during festivals or ordinary times still exists.