Local bleeding caused by trauma or surgery afterwards is mainly seen in the following four clinical situations: 1. It is well-known arteries and veins, such as portal vein or superior mesenteric artery, inferior mesenteric artery, superior mesenteric vein and inferior mesenteric vein or hepatic artery. Usually non-invasive vascular sutures are used to close the vessels so as not to cause impaired blood supply to the tissues and organs or even ischemic necrosis of the organs.2. Non-known arteries and veins, which do not affect the blood supply to the tissues and organs after local suturing and ligation without affecting the function of the tissues and organs, are usually sutured or ligated.3. Local capillary bleeding. If in can be a phase of suture, usually will be sutured, so that the local tissue extrusion and play a compression of blood vessels, to achieve hemostasis. 4, tissue trauma is relatively large, the location is relatively superficial, capillary blood seepage can not do a phase of suture, usually use petroleum jelly gauze compression to stop bleeding.