Is surgery necessary for smog that has been asymptomatic for years? Smog is a very rare disease. Patients with smog are like normal people when they do not have an attack, and the disease is usually detected only after an attack, which can last for a long or short time. Once the cerebral blood vessels are severely narrowed or occluded, the patient will face the risk of cerebral hemorrhage or cerebral ischemia, so timely treatment of smog is the greatest responsibility for smog patients. It is now accepted that conservative treatment for smog is basically useless, and once diagnosed, patients should be prepared for surgery. The traditional bypass surgery and the patch surgery are the earlier surgeries for smog in China, but they have their own drawbacks. The bypass surgery can improve the local blood supply in a short period of time, but the surgery is more difficult and the scope of blood supply improvement is relatively limited; the patch surgery can improve the scope of brain blood supply more, but the formation of blood vessels needs a certain period of time, usually 3-4 months, during which there is still a risk of ischemia, and This procedure is not very effective in some adults. As medical technology continues to advance, more sophisticated procedures have been introduced into the clinic. Combined vascular bypass has overcome the disadvantages of both procedures and combined them well compared to the two traditional procedures, with improved surgical results. Now, after this procedure has been widely performed, it has led more smog patients out of danger.