Being similar to man in respect of anatomy and physiology,pig is always used as the experimental animal in the reaserch of the cardiac-vascular system,digestive system,reproductive system,the diseases of aged,blood,nutriology,endocrinic system, dermatology, dentistry, eye,radio-biology and radioimmunology.In recent years much attention has been payed to the organ implantation of different species and pig as an organ provider has showed a very attractive prospects.