Abstract: Many Chinese herbal medicines contain effective antioxidant substances. In this article, we extract the antioxidants from the Glycyrrhiza uralensis Fisch, kudzu root and Sedum sarmentosum Bunge by water-cooking method, then the substances were extracted with petroleum ether and ethyl acetate. Put the extractions into the oil, and save the sample in the temperature case of 60℃. Measure the acid value and the peroxide value of the oil, study on the antioxidant activity of extracts of Chinese herbal medicine and compare it with the tea-polyphenols and the VE. The results showed that the extraction from Glycyrrhiza uralensis Fisch, kudzu root and Sedum sarmentosum Bunge exhibited high antioxidative activity comparable to the tea-polyphenols and the VE.

Key words: Chinese herbal medicine, extraction, oil, antioxidant activity