[Objective] The study aimed to research the optimized condition for eliminating the pyrogen in the hyaluronic acid(HA)with method of alumina and activated carbon absorption.[Method] With the HA recovery and pyrogen content in HA as the evaluation index,the conditions for purifying HA with the method of alumina and activated carbon absorption were optimized through the single factor test and the square recurrence orthogonal test resp.with the 4 factors of Alumia dosage,first stirring time,activated carbon do...