At present, the outstanding problems of feed industry, the contents of heavy metals in the raw material feed is often not up to the hygiene standards, is mainly inorganic salt as high dose of adding copper, iron, zinc and other elements. High doses of swine diets with copper (125 ~ 250mg/kg), not only has the growth promoting effect, and can make the skin redness, black pig feces, improve the business performance of feed, make breed a one-sided pig skin and fecal colors as the key measure of feed quality identification. For this kind of psychological needs to cater to the farmers, feed enterprises to continuously improve the content of copper, the minimum toxic dose addition amount of copper in feed products has reached or exceeded the pig. When the addition of copper 100~125mgA/kg in feed, pig liver copper increased 23 times; the addition of 250mg/kg increased 10 times; add to 500mg/kg, the liver copper levels can reach 1500mg/kg. High liver copper can affect liver function, reduce the content of Hb and blood hematocrit value. People eat the liver, there will be lower hemoglobin and yellow plague and other symptoms of poisoning. With the increase of copper content, add the amount of zinc, iron and other elements were also increased. In recent years, many enterprises add Zinc Oxide 2000 ~ 3000mg/kg to prevent diarrhea in piglets feed. The use of high zinc, High-speed Rail also will have a similar high copper residue and symptoms of poisoning.