Objective: To evaluate the quality of Glycyrrhizae Radix et Rhizoma based on Ggrey incidence degree method. Method: 30 samples of Glycyrrhizae Radix et Rhizoma were collected in Gansu

Inner Mongolia

Xinjiang and other representative habitats. On the basis of traditional appearance identification combined with the market present situation hierarchies of the samples for the determination of extract in samples

the contents of total polysaccharide

glycyrrhizic acid and liquiritin. Grey model was used by determining four main compositions contained in the samples. Result: The result of evaluating the quality of 30 samples was as same as that of medicinal products classification by the model. Samples were divided grade for the first

second

third sort of priorities by the quality of different grades.It was the best licorice of the same grade from different areas in Qingyang

Inner Mongolia

followed by Jinta

Minqin of Gansu province

Hangjinqi of Inner Mongolia

Jiuquan of Gansu province

Xinjiang korla and Zhongning of Ningxia. Licorice samples for the first grade in Shaanxi

Gansu were lower quality than the second licorice in Inner Mongolia. Conclusion: Grey incidence degree method and the model could be used to evaluate the quality of Glycyrrhizae Radix et Rhizoma.