Aspergillus oryzae is the important microorganism in the factory of brewage. It excreted many kinds of enzyme during its process of growth. Among them, the most important enzyme is protease which can decompose the legume protein into multi-peptide and amino acids. So Aspergillus oryzae plays a significant role in the production and flavor of food manufacturing industries, such as soy sauce, Chinese bean sauce, rice wine and so on. However, the strains of Aspergillus oryzae often shows low prod...