Feed-grade calcium hydrogen phosphate can be used as a supplement of phosphorus and calcium in feed processing. Because the ratio of phosphorus to calcium is the closest to that of animal skeleton, and can dissolve completely in animal gastric acid, it is easy to enter the animal body and participate in its metabolism. Maintaining the ratio of phosphorus to calcium in bone can promote the rapid growth of animal body and prevent various diseases caused by phosphorus and calcium in animals. At present, it is domestic. It is generally recognized as one of the best mineral additives for feed. It can accelerate the growth and development of livestock and poultry, shorten the fattening period and increase their weight rapidly. It can improve the breeding rate and survival rate of livestock and poultry, at the same time, it can enhance the disease resistance and cold tolerance of livestock and poultry, and it can prevent and cure the chondrosis, dysentery and paralysis of livestock and poultry. Generally, the total amount of feed added to animal feed is 1%-3%, and the average production of meat, eggs and milk of poultry and livestock is increased by 15%-20%. The economic benefit is remarkable.