Abstract: Corn flour,wheat flour,soybeans and other feed materials has been applied in commercial and self-prepared dog feed.Their proportion is high and can provide energy and various nutrients for dogs.However,the non-starch polysaccharides （NSP） in cell wall can not be digested by stomach of monogastric animals.They hinder the digestive enzymes from entering into the cells and thus decrease feed digestibility.In addition,they increase the viscosity of gastrointestinal contents and reduce the dog′s immunity.Thereby,NSP are generally considered anti-nutritional factors.In the production of commercial and self-prepared dog feed,NPS preparations are supplemented into dog feed,which can help dog digest NPS,destruct cell wall of plant,increase feed digestibility and enhance immunity of dogs.As the dog feed must be extruded or cooked in the production process,high-temperature NPS should be supplemented.Attention should be paid to addition time and amount,and enzyme activity should be ensured.