Abstract: Iron is an essential mineral element for piglets, if iron from breast milk can not satisfy the normal requirements of piglets without effective supplement methods, piglets are inclined to have occurrence of anemia and other diseases. Compared with inorganic and simply organic iron, chelated iron of amino acid has advantage of higher bioaetivity, lower pollution and higher safety. Based on the above facts, physiological function of chelated iron of amino acid and its application in pig-keeping were introduced in the article.