To optimize the conditions for the extraction of polyphenols,using quinoa which grown in Inner Mongolia as raw material,with yield as test index to extract polyphenols.The effects of ethanol concentration,material liquid ratio,extraction temperature and time on yield of quinoa polyphenols were investigated. Experimental factors and their levels were determined by single factor test. Subsequently,the Box- Behnken experimental design was performed to optimize the conditions for quinoa polyphenols extraction. ...