Objective: To evaluate the quantitative characteristic spectrum to control the quality of buyanghwanwutang the product by extent. Method: The Characteristic spectrum of buyanghuanwutang was established. In methodological study

peoniflorin as the reference peak to calculate the RSD of the relative retention time and relative peak area of each common peaks

precision

stability and reproducibility were investigated as well. The characteristic spectrums of 10 batches of buyanghuanwutang were established.The quality of buyanghuanwutang was evaluated by the correlation

cosine of the angle and extent similarity of ten batches

combined with the numericalsimilarity. Result: RSD of the relative retention time and relative peak area of common peaks of precision

accuracy

repeatability was less than 3%.The calculation results of Samples' correlation coefficient and angle cosine are above 0.95

it cannot reflect the differences among samples

but there is a great difference in extent similarity

so it can reflect the differences among samples. The combination of the extent similarity and numerical similarity was better than the correlation

cosine of the angle. The combination reflected the differences of different batches

and was used to control the quality of products. Conclusion: This method is accurate and reliable

for quality evaluation of Traditional Chinese Medicine.