Smog is a rare cerebrovascular disease, how many people get it? Smog is most common in children under 10 years of age and in middle-aged people around 40 years of age, and there is a tendency for smog to run in families, and many families with smog have been found. Therefore, it is important for family members of patients with smog to be examined to rule out asymptomatic smog. Smog is actually a progressive occlusion of the end of the internal carotid arteries bilaterally, while some capillaries at the base of the brain compensate for the expansion, because these capillaries are more dense, so it seems like a patch of blood vessels on the vascular image, and the imaging looks like a cloud of smoke. The cause of this disease is not clear and may not be detected as long as there is no attack. Its attack can appear as an ischemic stroke or a hemorrhagic stroke. The earlier the onset of the disease, the more important it is to evaluate it as early as possible. If the diagnosis is confirmed, early surgical treatment may prevent recurrent ischemic or cerebral hemorrhage and cognitive impairment. Smog is not a death sentence, nor is it a cancer, and should be treated positively, as the majority of cases have a good prognosis after treatment. At present, the effective treatment for smog disease is surgery, which includes simple patching, simple bypass surgery and combined vascular bypass surgery, and the best treatment is combined vascular bypass surgery, which is a combined vascular bypass + multifactor patching method. It is one of the advanced methods for the treatment of smog disease with better effect than the previous methods, with low surgical risk and significant effect, which has relieved the pain for most patients.