To make full use of starch-base raw materials, the starch must be hydrolyzed to small molecules in order to produce sweeteners or provide fermentable sugars. Starch & ethanol enzyme can catalyze this kind of reactions and convert starch to glucose. What's more, it can also hydrolyze the protein in starch-based feedstock to release more nutrition, increasing the yield of fermentation products. As a kind of food addictive, starch & ethanol enzyme plays an important role on starch sweetener and ethanol industry improving production efficiency greatly.