Corn Gluten meal is also called Corn Bran powder, mainly composed of corn protein, containing a small amount of starch and fiber. Protein in the pig gastrointestinal soluble protein and insoluble protein two states exist, insoluble protein easily and other macromolecules organic or trace elements of the combination, not easy to be absorbed by animals, almost all by the animal out of the body, is composed of feces dry matter ingredients. Starch contains resistant starch and chronic starch, resistant starch in the digestive tract is not easy to be hydrolyzed by amylase, absorption of water after the viscosity increases, affecting the peristalsis of the food, affecting the digestion and absorption of nutrients. The fiber composition of corn gluten powder is composed of NSP and lignin. The content, type and structure of NSP affect the digestion and absorption of ration, and also affect the utilization and excretion of nitrogen.