A 40-year-old female patient, the left lower extremity obvious varicose veins, accompanied by skin redness and blackness, localized heat, swelling, multiple ulcers and running water, severe pain. The patient sought treatment in many places for a long time, and was referred to our peripheral vascular department for diagnosis and treatment, diagnosed as congenital arteriovenous fistula, and was treated with selective vascular embolization, and the symptoms basically disappeared. The treatment method used here is endovascular intervention therapy. The so-called vascular intervention therapy is a special catheter selectively inserted into the target blood vessel, imaging, drug perfusion, embolization, balloon dilatation, placement of stents and other diagnostic and therapeutic methods. It is a high, precise and advanced technology in medicine at present. Selective angiography can clarify the scope, degree and nature of vascular lesions and provide guidance for treatment; selective drug infusion can improve the targeting of drugs, increase the therapeutic effect of drugs, and reduce toxic side effects. If a large stenosis is found, it can be dilated with a balloon, and after dilation, a stent can be placed to prevent restenosis. For some malformed vessels, embolization can be performed. For some large arterial aneurysms, pseudoaneurysms, entrapment aneurysms, etc., the traditional open surgery is very traumatic and has a high mortality rate, and the use of interventional therapy has become simpler. In short, vascular interventional diagnostic technology is rapidly developing, selective or super-selective cannula can be almost everywhere in the body, the past many difficult to diagnose and treat the disease is gradually resolved. Some diseases that were untreatable or difficult to treat in the past are now easy to treat. It is favored by the majority of doctors and patients because of its small trauma, fast recovery and good results.