1, phytase. Phytase is a hydrolase that degrades phytic acid, produces inorganic phosphorus and inositol, releases proteins and trace elements that bind to phytic acid, and is mainly added to monogastric and aquatic animals such as pigs, chickens, and ducks. In feed, it can effectively increase the utilization of phosphorus in feed, reduce environmental pollution, and reduce feed costs. 2, useful peacekeeping creatures. Microbial cells are rich in protein. In general, the dry matter of bacteria contains 50%-80% of protein, 40%-60% of yeast, and also contains a variety of vitamins. There are many types of microbial nutrition, and cheap, even abandoned industrial waste, agricultural and sideline products can be widely used to produce microbial protein feeds, that is, single cell protein feeds, such as yeast, the finished product is a yellowish powder, with a special flavor of yeast, Rich in B vitamins, choline, enzymes and more. Beverage yeast stimulates animal appetite, promotes animal metabolism and growth, improves animal quality, and shortens feeding cycles. The source of roughage for crop stalks, clams, vines, hay, and leaves in China amounts to 1 billion tons per year. The processing industry produces more than 1 million tons of sawdust each year. These crude feeds contain only 3%-4% of crude protein. It accounts for 30%-50%; cellulose in sawdust accounts for 50%, hemicellulose accounts for 15%-25%, lignin accounts for 15%-35%, and protein and mineral content are very low. The use of microorganisms to break down the characteristics of fiber-producing proteins can transform these waste materials into feed additive materials. At present, researchers have screened out some high-activity cellulases, which are suitable for the decomposition of crop straws, sawdust and other agricultural and sideline products and wastes, and can produce high-efficiency strains of feeds. They are also formulated to produce high-protein, aroma-producing, and palatability-producing substances. The strains, mixed fermentation, can also produce high-nutrition, good digestible quality feed. The research and development of the use of microorganisms to decompose cellulose materials can not only solve the serious shortage of protein feeds, alleviate the contradiction between human and animal crops, but also avoid and reduce waste of resources and environmental pollution. Another type of feeding microorganism is a photosynthetic microorganism, which is characterized by low nutritional requirements during growth. Particularly suitable for aquatic animal feed, it can realize high-density fish and shrimp farming, greatly increase production, and have the function of purifying water and preventing fish diseases. In recent years, returning to nature and advocating green have become the trend of people's daily consumption. In terms of livestock products, the quantity is no longer the primary issue of people's living needs, and the pros and cons of products have become the key to whether people need it. With China's accession to the WTO, the competition in the international market is becoming increasingly fierce. In order to improve the health standards of China's meat products, the demand for feed will become higher and higher. The promotion and use of green feed additives will play an important role in promoting the green progress of China's feed industry, solving the problem of drug residues, realizing the greenization of animal-originated foods, improving the competitiveness of livestock products in the international market, and ensuring the health of people.