The four traditional medicine markets are the places where the transactions of authentic medicinal materials in my country are most concentrated and the turnover is the largest, including Anguo, Zhangshu, Baiquan and Yuxian. (4) Yu County: Yu County is named after Dayu established his capital in 2205 BC. It is located in Zhongzhou, with convenient land and water transportation, and has been a commercial center since ancient times. Yu County also has the Temple of the King of Medicine, but it is not as famous as Anguo, Zhangshu and Baiquan. Therefore, it has become a nationally famous medicinal material distribution center mainly because of its business tradition and its authentic medicinal materials with unique processing and packaging techniques. . In the 17th year of Qianlong's reign, the first pharmaceutical merchant association was established in Yu County. More than a hundred years later, the Thirteen Gangs of National Medicine Stores successively set up guild halls in Yu County. Medicinal material trading conferences were held three times a year, each lasting for more than a month, and there were year-round operating agencies. In addition to collecting specialty medicinal materials from other towns, the people of Yu County also cultivated many authentic medicinal materials, such as Yu Baizhi, Yu Nanxing, Yu Baifu, etc. There are more than 200 kinds of wild and domestically grown authentic medicinal materials. While dealing in medicinal materials, Yuxian people also produced medicinal tools such as medicine dishes, medicine cups, medicine grinders, and medicine cutting knives. Their quality level was in a leading position in the industry at the same time. For example, the "Xiaoyuzhou Medicine Knife" is shaped like a full moon, with a sharp blade and a tight mouth. One betel nut can cut as many as 270 pieces. There have been many famous doctors in Yu County in the past dynasties, forming a collection and distribution feature that integrates production, supply, sales and use, with many medicine shops, medicine shops, medicine sheds and medicine shops.