"North Medicine" and "South Medicine" originally came from the common name of the medicinal material operator industry, which is the general name of the origin of authentic medicinal materials. Specifically, such as the four major Huai medicines and the eight flavors of Zhejiang. According to the geographical location, some take the Yangtze River as the dividing line, some take the Yellow River as the dividing line, and some take the genuine medicinal materials produced in the northeast as the northern medicine.