It can be divided into one-dip soybean meal and two-dip soybean meal. The one-dip soybean meal has advanced production technology and high protein content, which is the main variety circulating in the market at present. Soybean meal is irregular fragments, light yellow or light brown in color, and has the smell of roasted soybeans. Soybean meal can not only be used as the main raw material of livestock and poultry feed, but also be used to make pastry food, health food and cosmetics, and even be used as the raw material of antibiotics. Fish meal is more and more used in aquaculture, which contains a variety of amino acids and can meet the special needs of fish for amino acids. In addition, soybean meal is also used to make pet food. In feed industry, protein content of soybean meal is regarded as an important index to measure feed quality. It is generally believed that the higher the content of protein, the better the feed quality.