Endothelial cells are a kind of human epithelial cells, a single layer of flat epithelial cells, mainly located in the intima of blood vessels. Endothelial cells are polygonal in shape and closely associated with each other, forming the complete intimal structure of blood vessels. The integrity of the endothelial cell structure has a very important role in maintaining the normal blood circulation in the human body. Only when the endothelial cell structure is intact, the human body will not bleed, and if the endothelial cells are damaged, the symptoms of bleeding will occur. At the same time, endothelial cells also have a strong anticoagulant effect and can secrete many anticoagulant substances to ensure that the blood does not bleed and at the same time ensure that the body’s blood does not form blood clots. If the endothelial secretion function is damaged, thrombosis will occur. The integrity of the endothelial cell structure and function is very important to maintain the blood circulation in the human body.