Intestinal vascular malformations, including arteriovenous malformations, vasodilatation, hemangioma, vascular dysplasia, etc., are one of the causes of acute or chronic lower gastrointestinal bleeding, which is often an abnormality of the blood vessels themselves, or one of the manifestations of a certain systemic disease or a syndrome. Clinical diagnosis is mainly based on the following points. 1, clinical features. Selective intestinal angiography. 3, Endoscopy. 4, Nuclear imaging. 5, Surgical exploration. The duration of intestinal vascular lesions in patients varies, most of them are long, and the longest ones can reach decades. Bleeding mode is diverse, can be acute massive bleeding, repeated intermittent bleeding and chronic small amount of bleeding. Most of the bleeding is self-limiting or can be temporarily stopped by hemostatic drugs, blood transfusion, etc., and hemoglobin can return to normal. There are no positive signs and symptoms when there is no bleeding.