Abstract: Iron is one of the essential trace elements for the life activities of human and animals. It participates in the biosynthesis and metabolism of hemoglobin,myoglobin and many kinds of oxidases and it is closely related with enhancing the organism immunity, increasing animal＇ s reproductivity and growth indicators . As a kind of high-quality organic iron source, iron amino acid chelate was paid attentions to because of its advantages （high absorption rate, high biological efficiency and little pollution to the environment and so on）. The absorption and metabolism in vivo, physiological functions of iron amino acid chelate and its applications in the practice were elaborated, in order to provide references for the related researches.