Cyanosis or necrosis of the fingers is an ischemic symptom of the upper extremity in the clinical manifestations of subclavian artery steal syndrome, commonly followed by intermittent dyskinesia, upper extremity weakness, pain and abnormal sensation, and rarely causing cyanosis or necrosis of the fingers. There are no effective preventive measures for this disease, and the following is an introduction to the relief methods for this disease. Patients with subclavian artery stenosis or occlusion may not have cerebral symptoms, and only a few present with clinical manifestations of inadequate vertebrobasilar artery supply. 96 cases were observed by Ackemann et al. using Doppler ultrasonography in a 2-year follow-up, and only 15% showed symptoms of inadequate vertebrobasilar artery supply, so their course was mostly benign. In elderly patients with atherosclerosis, anticoagulation or antiplatelet aggregation agents can be administered to reduce thrombosis and development. In rare cases caused by giant cell arteritis, steroid therapy may be used. Surgical treatment is mostly applied to patients with recurrent symptoms and affects life and labor. Previous surgical methods mostly used subclavian-subclavian artery, axillary artery-axillary artery, carotid-subclavian artery bypass graft, etc., but their risks are greater. Currently, percutaneous endovascular angioplasty is mostly used. In China, Takayama et al. reported 15 symptomatic patients treated with PTA, which was considered safe, and long-term postoperative application of anticoagulation and antiplatelet aggregation drugs achieved satisfactory long-term results.