In the traditional system of Chinese herbal knowledge,the term daodi refers to specific geographic regions that are particularly suitable for the growth of a specific medicinal herb.It has become a standard for evaluating the quality of herbs based on their locality.In the Ming Dynasty,the officially compiled,Bencao pinhui jingyao,introduced the category of daodi for the first time,listing a catalog of notable locations where specific medicinal herbs were produced.This paper examines the development of daodi knowledge by comparing Bencao pinhui jingyao with its predecessor,the Song Dynasty's pharmacopeia,Jingshi zhenglei beiji bencao.Specifically,it explores the role of images in this process.The study reveals that daodi information was derived from Jingshi zhenglei beiji bencao,and the geographical labels on the images served as crucial references.Images played a significant role in highlighting the regional variations of materia medica,leading to the establishment of daodi as the official evaluation standard for medicinal herbs in the Ming Dynasty.