Moyamoya disease is a chronic cerebrovascular occlusive disease characterized by severe stenosis or occlusion of the siphon of the internal carotid artery (ICA) and the beginning of the anterior and middle cerebral arteries on cerebral angiography, and compensatory proliferation of small vessels such as the soft meninges and penetrating arteries at the base of the skull to form an abnormal vascular network at the base of the brain. The diagnostic criteria are as follows: bilateral stenosis or occlusive changes at the end of the ICA and/or at the beginning of the anterior and middle cerebral arteries, and an abnormal vascular network near the occlusion is visible in the filling phase of the skull base arteries, without systemic disease. Unilateral stenosis-occlusive changes with anomalous vascular network, progressive development of definite smoldering disease, at which point a diagnosis of smoldering disease is possible. ”The CNS Vascular Disease Research Committee classifies smog into 4 types: transient ischemic attack (TIA) type, infarct type, epileptic type, and hemorrhagic type. In China, ischemic type accounts for 63.4%, hemorrhagic type 21.6%, epileptic type 7.6%, and other conditions 7.5%. ischemic type is predominant in children under 10 years of age and presents as recurrent TIA or cerebral infarction with motor, consciousness, speech and sensory impairment, due to narrowing or occlusion of the main artery at the base of the brain early in the disease, before compensatory vessels are well formed. Symptoms of cerebral ischemia can be precipitated by hyperventilation. Prolonged ischemia can lead to mental retardation. Adult patients, especially females, have a predominantly hemorrhagic pattern, with ventricular hemorrhage, subarachnoid hemorrhage, and intracerebral hemorrhage occurring more frequently than in pediatric patients. It is mostly due to rupture of collateral vessels or associated aneurysms. Headache, impaired consciousness and limb paralysis are common symptoms, and massive hemorrhage can lead to death. Seizures can occur in all patients, but are most often seen in children under 10 years of age. There are three types of surgical revascularization: direct bypass, indirect bypass, and a combination of the two. Surgical revascularization is performed to provide additional collateral flow to the ischemic brain tissue to improve local cerebral blood flow and prevent or minimize irreversible brain tissue damage. Collateral blood flow via bypass is also expected to have the effect of reducing the hemodynamic stress state to the smoke-like vessels, which ultimately has the effect of preventing events from occurring.