Alliurn chinense peel is the main by-product of the allium chineuse processing. In ethyl alcohol was used to extract and seperate allicin from allium chineuse peel and its optimal conditions was determined, by extracting ternperature, extraction time, ethanol volume fraction, the ratio between the allium chinense peel slurry and ethyl alcohol do single factor experi~t, By extracting temperature, extraction time, ethanol volume fraction for test factor, allidn content for response value, the response surface method to optimize the extraction pro...