The need for bypass surgery for cerebral infarction is determined by the cause of cerebral infarction. If the cerebral infarction is an acute cerebral infarction caused by arterial thrombosis, intravenous or arterial thrombolysis and transarterial mechanical thrombectomy can be performed to remove or dissolve the thrombus, so that the blood vessel blocked by the thrombus can be reopened without bypass. If the cerebral infarction is caused by narrowing of the blood vessel due to carotid intima and atherosclerosis, carotid endarterectomy or carotid stenting can be performed to restore the normal diameter of the blood vessel, and bypass is not required. In case of cerebral infarction caused by congenital or acquired stenosis or occlusion of large blood vessels at the base of the skull due to vascular malformation, such as smog disease, as it is a cerebral infarction caused by non-thrombosis and intimal thickening, only bypass surgery can be performed to take a bypass of the superficial temporal artery and middle cerebral artery to restore intracranial and extracranial blood flow.