Cerebral angiography is a new X-ray technique that has been widely used in clinical practice since the 1990s and is the most effective way to examine cerebrovascular disease. By injecting an iodine-containing contrast agent into the internal carotid artery or vertebral artery, the cerebral vessels are visualized to understand the morphology and lesions of the cerebral vessels themselves, as well as the nature and extent of the lesions. This test is of particular value in the diagnosis of cerebrovascular disease. Cerebral angiography is a more accurate method to understand the atherosclerosis, stenosis or the presence of hemangioma in the internal and external blood vessels of the brain, and is performed by routinely puncturing the patient’s femoral artery, inserting a catheter about 1.5mm thick retrograde along the femoral artery, selecting the catheter into the beginning of the internal carotid artery and the beginning of the vertebral artery on both sides, and injecting a certain amount of contrast agent to show the morphology of each blood vessel in the brain, the blood supply to the brain tissue and the circulation of cerebral blood. It can show the morphology of each blood vessel in the brain, the blood supply to the brain tissue and the circulation of cerebral blood flow, so as to understand whether the cerebral artery, the blood perfusion of the brain tissue and the cerebral venous return flow are normal, which cannot be done by other examinations. The safety factor and positive diagnosis rate of the whole examination are very high, and the positive cases of the whole cerebral angiography in dozens of cases done in our hospital in recent years accounted for 98%, and no complication occurred. Whole-brain angiography is irreplaceable by other examination equipment. It is the gold standard for diagnosing certain diseases, and there are more diseases that require cerebrovascular examination. However, whole brain angiography must be done in the following cases: 1. Subarachnoid hemorrhage is mostly caused by intracranial aneurysm or vascular malformation. In order to make a clear diagnosis for surgical treatment, cerebral angiography must be done. 2. Patients with transient cerebral ischemic attack mostly have cerebral vascular stenosis, which is a hidden danger of cerebral infarction, so cerebral angiography is performed in order to serve as a basis for surgery.