酸性蛋白酶的性質與動物的胃蛋白酶和凝乳酶相近，酶蛋白中，酸性氨基酸較多而堿性氨基酸少，在動物的胃中能保持很高的活性，可以有效補充動物胃中內源蛋白酶的不足。
　The nature of acid protease is similar to pepsin and Rennin in animals. The enzyme protein has more Acidic amino acid and less basic amino acids. It can maintain high activity in the stomach of animals, it can effectively supplement the deficiency of endogenous protease in animal stomach.