Conjugated linoleic acid (CLA) is one of the essential fatty acids for human and animals, but it is unable to synthesize a substance with significant pharmacological effect and nutritional value, which is of great benefit to human health. A large number of literatures have proved that conjugated linoleic acid has the physiological functions of anti-tumor, anti-oxidation, antimutagenicity, antibacterial, reducing human cholesterol, anti atherosclerosis, improving immunity, improving bone density, preventing diabetes and promoting growth. In recent years, some clinical studies have proved that conjugated linoleic acid can increase physical consumption after entering the body, so it can effectively reduce body fat deposition in weight control.