Abstract: Introduced in this paper was the method of extraction of hydrolyzed animal protein (HAP) from eel scraps by protease. Through the ofthogonal tests of hydrolization with the three enzymes,namely papain, pepsinum and hay bacillus protease, it was found that the hay bacillus protease was the most effective protease for hydrolyzing HAP. The degree of hydrolysis (DH) by the hay bacillus protease was 82.6% under the optimum hydrolyzing conditions: 50℃, pH 5.0, ratio of scraps and water being 5:4, the protease content being 2.0% of the protein contained in the scraps, and the reaction time as 5 h.

Key words: Eel scraps , Hydrolyzed Animal Protein(HAP) , Degree of hydrolysis