Unilateral renal artery stenosis is mainly a narrowing or blockage of the main trunk or branches of the renal arteries, resulting in altered blood flow dynamics to the kidneys, and is usually not curable. It can be improved by medication (aspirin, nifedipine) and surgery (balloon dilatation renal angioplasty). Renal artery stenosis is unilateral or bilateral renal hypoperfusion caused by narrowing of the renal arteries. The two most common causes are atherosclerosis and myofibrillar dysplasia. Clinical improvement of symptoms and prevention of cardiovascular complications can be achieved by medication or surgery. 1. Drugs: If accompanied by high blood pressure, the symptoms can be improved by controlling the blood pressure level with drugs, such as nifedipine and chlorosartan, under the guidance of a doctor. Meanwhile, oral aspirin and statin drugs (atorvastatin calcium, etc.) can be taken to prevent cardiovascular complications. 2. Surgery: including balloon dilatation renal angioplasty and placement of stent, balloon dilatation renal angioplasty is to open the renal artery through balloon dilatation, which is mainly applicable to fibromuscular dysplasia, and placement of stent by placing a stent in the stenosis to prevent renal artery from re-stenosis, which is mainly used for renal artery stenosis caused by atherosclerosis or aortitis. If unilateral renal artery stenosis occurs, it is necessary to seek medical treatment in a timely manner in a regular hospital, do not blindly use drugs.