It is well known that trace elements are important to humans, as well as to animals. Although trace elements occupy a very small proportion, their importance cannot be ignored. Whether it is in the growth and development of animals, or metabolism, including disease prevention and improve feed utilization, it plays a very important role. In the absence of certain trace elements, it will have extremely serious consequences on the health of animals and may even lead to the death of the animal. Therefore, feed containing trace elements is not lacking. This article will explain the knowledge about trace element feed.