Trace elements are one of the indispensable nutrients in life sports, and they are also called "life metals". They are involved in the formation and activation of enzymes, vitamins and hormones in animals; they are also involved in regulating material metabolism, and determine the growth and development and reproduction of the body, as well as the production efficiency and product quality of animals. However, if used improperly, excessive or insufficient, it can disturb the mechanism of life movement, cause animal malnutrition or poisoning, and cause animals to show a series of diseases. Such cases are common. Therefore, trace elements must be strictly controlled and rationally used in feed.