Abstract: The content of moisture、ash、acid insoluble ash and water-soluble extract of Yaobath powder were determined according to the general principles of “Chinese Pharmacopoeia” （Volume IV）,2015; The microscopic identification characteristics of Yaobath powder was observed, and TLC characteristics was identified. The content of β-asarone in Yaobath powder was determinated by HPLC. It was suggested that the water content in Yaobath powder should not exceed 9.00%, ash content should not exceed 10.00%, acid insoluble ash content should not exceed 1.30%, and water-soluble extract content should not be less than 19.00%. The microscopic characteristics of Albizia julibrissin Durazz、Spatholobus suberectus Dunn and Acorus tatarinowii Schott were obvious. The TLC spots were clear and negative without interference. The content of β-asarone in Yaobath powder range from 0.71% to 0.85%, RSD was 2.48%. The content of β-Asaron in Yaobath powder of different batches was basically stable. The established quality control method had good repeatability and specificity, and can be used for the quality control of Yaobath powder.

Key words: Yaobath powder, quality standard, β-asarone;