Antioxidant activity of liquefied protein of three-spot hippocampus was observedFour groups of single factor experiment and 16 groups of orthogonal experiment were carried out for optimization of the experiment, and the antioxidant activity of liquefied protein of three-spot hippocampus was determined based on the scavenging rate of DPPH radical.The liquefied protein hydrolysis and the scavenging rate of DPPH radical were the highest with solid-liquid ratio of 1:10, reaction time 6 h and 1% enzyme dosage, the antioxidant activity of extract of DPPH radical was also the highest.Liquefied protein of hippocampus was successfully extracted, and the antioxidant activity of hydrolytic solution to DPPH radical was determined, to provide theor. basis for utilization of hippocampus.