Mainly the acidity depends on the organic acids, whose content and type can influence the quality of the final products. Organic acids play a very important role in Chinese rice wine. They can effectively regulate the acidebase balance during the fermentation process and affect the wine’s color, flavor and biological stability. An appropriate amount of organic acids could inhibit the growth of contaminating with bacteria, reduce the sweet tasting and enhance the strong flavor of wine. The organic acids can also promote the formation of esters during storage. These acids originate from the raw materials released or developed during the subsequent brewing processes: alcoholic fermentation, malolactic fermentation, and
oxidation of the ethanol (Mato, Suarez-Luque, & Huidobro, 2005).