肠道是人体重要的消化、吸收器官。近几年,随着科学技术的进步和临床科研的发展,人们逐渐认识到了肠道的免疫、内分泌、黏膜屏障等功能。肠道屏障功能是指肠道上皮具有分隔肠腔内物质,防止致病性抗原侵入的功能。在正常情况下,肠道具有屏障作用,能使细菌和内毒素局限在肠道内, Intestinal is the body’s important digestion and absorption of organs. In recent years, with the progress of science and technology and the development of clinical research, people gradually recognize the intestinal immune, endocrine, mucosal barrier and other functions. Intestinal barrier function refers to the intestinal epithelium with intestinal material separated to prevent the intrusion of pathogenic antigens. Under normal circumstances, the intestine has a barrier effect, can make bacteria and endotoxin confined to the intestine,