Cerebrovascular disease is a series of diseases that cause brain damage due to obstruction, rupture, abnormal development or abnormal function of cerebral blood vessels. It is characterized by high morbidity, mortality, disability and recurrent attacks, and has become the number one disease that seriously endangers human health. The onset of cerebrovascular disease is often very sudden and extremely dangerous, and rapid changes in the condition may occur within a short period of time, resulting in a crisis and life. Once the disease develops, the only way to save lives and preserve functions is to arrive at a hospital that is equipped to treat it in the shortest possible time. In fact, most cerebrovascular diseases such as subarachnoid hemorrhage caused by intracranial aneurysm, cerebral hemorrhage caused by arteriovenous malformation, cerebral infarction caused by severe cerebral arteriosclerosis stenosis, etc. may have mild symptoms such as headache, dizziness, blurred vision, hand and foot weakness, etc. before the onset of the disease. At this time, if relevant examinations are conducted in a hospital in time, the above-mentioned lesions can be detected early through existing non-invasive detection methods (such as CTA, MRA, etc.), and most of them can be completely cured through minimally invasive treatment methods. The proportion of such diseases that are diagnosed and treated before the onset is as high as 70-80% in developed countries in Europe and America, but only about 5% in China at present. This shows that for cerebrovascular diseases, pre-onset examination and prevention are far more important than post-onset treatment.