Many patients always feel that doctors are surrounded by the same examination, but in fact, each examination has its advantages and disadvantages. The examination of cerebrovascular disease usually requires the following means: 1, cardiac ultrasound and dynamic electrocardiogram: because the heart is a “pump”, if there are “impurities (such as rheumatic valve lesions with thrombus)”, it will directly block the cerebral vessels from the upper brain, and will appear Therefore, if there is any clinical suspicion, it is necessary to perform cardiac ultrasound and dynamic electrocardiogram. 2.Carotid artery and vertebral artery ultrasound: the blood vessels supplying the brain in the neck, usually there are two carotid arteries and two vertebral arteries, a total of four vessels, any one occlusion or stenosis can cause the corresponding infarction foci; 3.TCD (Doppler): the bilateral anterior cerebral artery, middle cerebral artery, posterior cerebral artery, double vertebral artery and base artery in the cranium can be observed by Doppler to observe the speed and spectrum of blood flow to determine whether there is stenosis and compensatory artery. The Doppler can be used to determine the presence of stenosis and compensatory conditions. However, Doppler is closely related to the level of the operator. 4.CT/MR examination: This examination is relatively objective, CT is sensitive to determine bleeding, while MR is not the preferred method to determine bleeding. Because there are usually two kinds of stroke (hemorrhage and ischemia), if it is CT, it usually takes 24 hours after the symptom occurs to show up (just like we bump the soft tissue today and only see the soft tissue swelling tomorrow), but MR (DWI) will be sensitive to ischemia, even if it is half an hour after the onset of the disease, the lesion can be seen. 5, CTA/MRA these two tests are to examine the blood vessels: CTA to play contrast, while MRA does not need to play contrast, relatively speaking CTA than MRA will be closer to the real, but both need reconstruction. Not every hospital carries it out. 6.SA (year-round angiography): So far, whole brain angiography is a local contrast to magnify and visualize the blood vessels, which is more realistic to see the degree of stenosis, so it is still the gold standard to diagnose stenosis. However, because of the risks involved and the invasive nature of the test, it is usually done only when indicated in clinical practice.