Intestinal vascular malformations, including arteriovenous malformations, vasodilatation, hemangiomas, and vascular dysplasia, are one of the causes of acute or chronic lower gastrointestinal hemorrhage, and are often abnormalities of the blood vessels themselves, or they may be one of the manifestations of a particular systemic condition or a syndrome. Clinical attention should be paid to the differentiation of other diseases. 1, peptic ulcer: this disease is a chronic, periodic attack of the disease, often manifested as rhythmic pain, accompanied by acid reflux, belching, mostly in the fall, winter, spring attack, barium meal, endoscopy and angiography can be distinguished from vascular malformation. 2.Gastrointestinal tract tumor: such as gastric cancer, small intestine lymphoma, colorectal cancer, etc., which can also be manifested as gastrointestinal bleeding, and the amount of bleeding can be big or small, depending on the location, size and nature of the tumor, and there are often manifestations of loss of appetite, emaciation, abdominal pain, abdominal distension, etc. Barium meal, endoscopy with biopsy and angiography can confirm the diagnosis, and caesarean section can be used to investigate the tumor if necessary. 3.Gastric and intestinal polyps: only gastrointestinal bleeding without other clinical manifestations, endoscopy plus biopsy histopathological examination and X-ray barium meal examination can be differentiated from vascular malformation.