PAYLEAN (ractopamine) on commodity pigs and the use of ractopamine is a pharmaceutical raw material, is β A stimulant for the treatment of congestive heart failure punch cardiac disease drug. It can also be used to treat muscular dystrophy, muscle growth and reduce fat accumulation, but because of the larger side effects, is now being widely used in clinical use. Ractopamine blind excessive use, causing great harm, if ractopamine excessive intake can cause nerve, muscle tremor, palpitation, trembling, headache, nausea, vomiting and other symptoms. A huge amount may cause high blood pressure, severe heart disease can lead to death. β agonist is a human and veterinary drugs as asthma. Super doses in animals can adipose tissue into muscle tissue, because it can significantly improve fat ratio and production efficiency, β agonists is often abused in livestock production. Strict, standardized, convenient means of detection is imperative. Commercial pig producers aim is to efficiently produce good quality lean pork to compete with other animal products. Lean carcass pricing system has led to a further selection of lean growth rate, feed conversion and carcass lean. Clenbuterol use in the pig industry worldwide is illegal, it should recognize ractopamine hydrochloride approved the production and use can require a lot of experimental verification, and for quite some time in China.