The causes of arteriovenous endovascular fistula occlusion include low blood pressure during dialysis, poor blood flow, and hypercoagulation of blood. To reduce the incidence of arteriovenous fistula occlusion, it is necessary to standardize the prevention under the guidance of doctors, such as raising blood pressure, relaxing tourniquet, anticoagulant treatment and so on. 1. Low blood pressure during dialysis: When blood pressure is too low, the dialysis blood flow is too slow, and it is easy to stagnate in the blood vessels and lead to arteriovenous fistula occlusion, so you can raise the blood pressure appropriately during dialysis to keep the blood vessels full. At the same time, if there is diarrhea, nausea, vomiting, gastrointestinal bleeding and other conditions that lead to a decrease in blood volume, blood pressure should be closely monitored to prevent hypotension during dialysis. 2. Poor blood flow: when the blood flow is poor, it is necessary to pay attention to timely relax the tourniquet bandage to maintain blood flow. If the patient’s internal fistula has stenosis, it is easy to lead to poor blood flow, which may lead to occlusion of the fistula. It is recommended that the patient should regularly monitor the vascular ultrasound of the limb on the side of the fistula to assess the vascular condition. 3. Blood hypercoagulation: blood in a state of hypercoagulation, easy to block, can be under the guidance of the doctor preventive use of some anticoagulant drugs, such as heparin and so on. There are many other reasons for arteriovenous fistula occlusion, it is recommended that patients consult a regular hospital in a timely manner, after the doctor to improve the relevant examination, to exclude the relevant risk factors, to choose the most suitable way of prevention for patients, to avoid delaying the time of treatment.