ß- glactosidase very important enzyme for many people allover the world specially children for overcoming lactose intolerance problem. Lactose of milk can¿t be break down in small intestine into glucose and galactose in people lacking ß -glactosidase enzyme. This led to irritation of the intestinal mucosa and giving rise to cramps, flatulence and diarrhea. In addition the enzyme has many applications in dairy industry.