Lysine is a kind of human essential amino acid. It can enhance hematopoietic function, gastric secretion, improve use efficiency of protein, increase disease resistance, keep metabolic balance and be in favor of children body and intelligence development. Our country specifies that in noodle flour, biscuit and bread, its usage dose is 1~2g/kg; in oral liquid, its usage dose is 0.3~0.8g/kg. Lysine is a fodder nutrition enhancer with function for improving appetite of beasts and birds, disease resistance, wound healing, meat quality and enhancing gastric secretion. It is an essential material for compounding cranial nerve, germ cell, protein and hemoglobin.