Abstract: With the increasing amount of the corn in alcohol production, a lot of by-products called Corn DDGS are produced. Corn DDGS is a valuable component of forage, because it reserves the protein and other nutrient components of the original corn to the utmost extent, and also because the nutrition and active factor of Qu saccharification and yeast are involved. So it is a good raw material of protein forage with high protein, high nutrition and no antinutritive factor. The paper mainly summarizes the four aspects of DDGS including its composition, nutritional characteristics, application status in animal diet, and application prospect.