In recent years, cardiovascular and cerebrovascular diseases have gradually become more prevalent, posing a serious threat to human health. One of these cerebrovascular diseases, smog, was once considered to be a very rare disease, but in recent years, with the improvement and popularity of medical imaging technology, the detection and incidence of smog has been increasing year by year. Many smog diseases develop with cerebral ischemia and cerebral infarction, such as headache and dizziness, or unfavorable limb movement, numbness and weakness, or visual impairment, blurred vision, etc. Once examined in the hospital, there may be cerebral infarction and ischemic foci in the brain. Many patients may not know what ischemic foci in smoker’s disease means. Smoker’s disease is a narrowing or occlusion of the major arteries of the brain, followed by an abnormal vascular network disease of the skull base. Narrowing or occlusion of the major arteries causes insufficient blood supply to the brain. In the case of cerebral ischemia, some brain tissues lack sufficient oxygen and nutrients and become softened or necrotic, which is called an ischemic focus. This can cause some neurological dysfunction, and in case of large ischemic foci, it may even be disabling and fatal. In addition to cerebral ischemia and cerebral infarction, smog also often causes cerebral hemorrhage, which is also very dangerous and has a very high disability and death rate. Therefore, smog is a very dangerous disease and should be treated promptly once it is diagnosed. The treatment of smog disease generally requires cerebrovascular bypass surgery to re-establish good cerebral blood flow collateral channels to improve cerebral blood supply in order to achieve treatment. There are direct vascular bypass, indirect vascular bypass and combined vascular bypass surgery, among which combined vascular bypass surgery is a combination of direct and indirect bypass, which can be done in the same surgery to achieve a better and more comprehensive blood supply improvement.