Background/Introduction: Acidic protease (ACP) can act on interior bond -C-NH- to hydrolyze the proteins of vegetable and animal in acid environment to form small peptides and amino acidics. The addition of this product to the processing of alcohol and distilled spirit can promote the growth of yeast to accelerate fermentation speed and improve alcohol productivity. In feedstuff industry, this product can be used as an additive by combined with other enzymes (such as cellulase, pectinase and bet