The content of piceid was determined by UV-TLC.The content of emodin was determined by UV.The anti-bacterial activity of extraction fluid was determined by method of flat plate drilling.

• 采用乙醇加热回流法提取虎杖药材中的有效成分，分别测定白藜芦醇苷、大黄素含量，并测定了提取液的抑菌活性。