Abstract:The industry of germ-free animals has been a hot spot in research along with the rapid development of studies on the relationship between microbiota and host diseases.Because it is pathogen-free,and the high degree of similarity in anatomy,physiology,pathogenesis to humans,germ-free pig is considered a clinical relevant model to be widely used in life science research.Based on the current state of research of germ-free pig cultivation at home and abroad and the experimental studies carried out in our laboratory as well,this article gives a simple discussion on germ-free technique of domestic pigs.