The blackened intestine indicates that the intestine has become ischemic necrosis and can no longer be preserved. During surgery, the blackened intestine, that is, the necrotic section of the intestine, should be removed and the two ends of the good intestine should be reanastomosed. Generally, intestinal necrosis occurs in the presence of intestinal obstruction, after the formation of an intra-abdominal hernia or inguinal hernia entrapment, which is mainly caused by intestinal ischemia and hypoxia. The early manifestation is venous stasis, then the intestinal canal is edematous, dilated and thickened, and the later manifestation is insufficient arterial blood supply, that is, the arterial ischemia leads to necrosis of the intestinal canal.