[Evolution and characteristics of system,assessing quality by distinguishing features of traditional Chinese medicinal materials, of Dao-di herbs of Astragali Radix].

"Assessing the quality by distinguishing features of traditional Chinese medicinal materials" is a characteristic quality evaluation system of traditional Chinese medicine, and it is also the basis of "Rating according to characters and setting the price by the grade" on the market. Astragali Radix was regarded as a famous traditional Chinese medicine (TCM), and this paper has carried out herbal textual research on the development and formation of the concept, "assessing the quality by distinguishing features of traditional Chinese medicinal materials", of Astragali Radix. The authentic medicine producing areas of Astragalus in China have experienced a great change, Gansu , Sichuan and adjacent areas before the Tang Dynasty; Shanxi during the Tang and Song Dynasty. The concept, "assessing the quality by distinguishing features of traditional Chinese medicinal materials", of Astragali Radix was formed in the Song and Ming Dynasty and still used today, which described as that the shape is "straight as an arrow"; the texture is "soft as cotton"; the section looks like" gold well and jade hurdle"; it was sweet in taste and has beany flavor. The system, "assessing the quality by distinguishing features of traditional Chinese medicinal materials", of Astragali Radix has undergone the adjustments from "true or false" to "good or bad", advance with the times, pick out the advantages from others and absorb the experience of traditional identification actively. Besides, it always returns to laconism from erudition and was summarized highly. Assessing the quality by distinguishing features of traditional Chinese medicinal materials and commodity specifications have the same root, so the former has reference meaning to revise the latter.