Smoke disease is a chronic progressive cerebrovascular occlusive disease of unknown etiology, mainly manifested by unilateral or bilateral narrowing or occlusion of the middle cerebral artery and proximal anterior cerebral artery at the end of the internal carotid artery, resulting in the formation of abnormal small vessels at the base of the skull. The disease is named “smog” because the abnormal small vessels on cerebral angiography resemble smoke. In the past, because many people did not know much about smog, they were not clear about its causes, symptoms and treatment methods, which led to the disease becoming more and more serious and eventually brought a great burden to themselves and their families. Generally speaking, people are not unfamiliar with some cerebrovascular diseases such as cerebral infarction and cerebral hemorrhage when they hear about them. However, very few people know about smog disease. Most patients only become aware of smog disease after they become ill. Smog is a rare cerebrovascular disease with clinical manifestations such as cerebral ischemia, cerebral hemorrhage, cerebral infarction, etc. It is still a major threat to the health and safety of patients. Smoke disease is a very dangerous disease with a chronic and progressive development. If the disease is not treated in a timely manner, once a stroke occurs, the patient may become paraplegic and disabled, or the patient may become life-threatening. At present, for the treatment of smog disease, some hospitals are often not good at it, taking a single bypass or patching, the former has the defect of limited blood supply range, and the latter has the risk of stroke, so these two procedures are not desirable. In contrast, combined vascular bypass surgery, which combines bypass + patching together, takes the treatment of smog disease to a new stage. This procedure can improve the symptoms of cerebral ischemia and reduce the rate of rebleeding, which is a more advocated treatment option for smog disease.