According to the degree of stenosis of A2 segment of the left anterior cerebral artery, conservative treatment or surgery can be chosen. 1. Conservative treatment: When the degree of stenosis of A2 segment of left anterior cerebral artery is less than 70%, the patient does not have obvious clinical symptoms, and the angiography examination finds that the blood vessel is well compensated, conservative treatment can be chosen. Patients should take statin lipid-lowering drugs, such as atorvastatin calcium tablets, and control blood pressure, quit smoking and drinking, and take a low-salt and low-fat diet as prescribed by the doctor. At the same time, regular review, stenosis worsening or the emergence of obvious symptoms should be timely treatment. 2. Surgery: If the stenosis of the left anterior cerebral artery A2 is more than 70%, or if obvious clinical symptoms have appeared, such as limb weakness and speech difficulties, then surgery is needed. Generally, a stent is used to expand the blood vessel to maintain normal perfusion of cerebral blood flow, and long-term anti-platelet medication is required after the operation, with regular review. When localized stenosis of A2 segment of left anterior cerebral artery is found, it is necessary to go to the hospital in time to improve the relevant examination under the guidance of the doctor and give symptomatic treatment.