Objective: To establish grey relational analysis for quality evaluation of merchandise Baitiao Codonopsis Radix. Method: Fifty-two samples of Baitiao Codonopsis Radix were collected from six main producing areas in Gansu province

grade division was adopted by traditional shape description combined market situation

conents of lobetyolin

atractylenoide Ⅲ

alcohol soluble extract and total polysaccharides in Baitiao Codonopsis Radix were determined.Quality evaluation of Baitiao Codonopsis Radix grey relational degree model was established by grey relational analysis. Result: Relative relation grades of all evaluation unit sequence were between 0.322-0.551

relative relation grades from 25 batches of samples were less than 0.450

which had high quality evaluation

many of them from main producing areas

such as Lintao county and Weiyuan county.Relative relation grade among the top 43 of samples

included 10 batches from Lintao county

9 batches from Weiyuan county

4 batches from Zhang county

accounting for 100.0%

100.0% and 44.4% of the total number of their samples in this area

indicating that quality of Baitiao Codonopsis Radix from Lintao county and Weiyuan county was excellent.It was consistent with the field survey. Conclusion: This method and model can be extended to quality evaluation of other estate medicinal materials.Current commodity grade division of Baitiao Codonopsis Radix can not match the actual needs.