Cerebral angiography is a screening technique that involves placing a catheter through a puncture in the patient’s thigh or arm artery and inserting the catheter into the cerebral artery to be visualized, injecting a contrast agent, and computer-assisted imaging for the diagnosis of cerebrovascular disease. Cerebral angiography is currently the gold standard for the diagnosis of cerebrovascular diseases. It requires a catheter to be placed through a puncture in the patient’s artery, and the catheter to be placed into the target cerebral artery, and an iodine-containing contrast agent to be injected through the catheter, followed by electronic computer-assisted imaging, in order to clarify the integrity of the blood vessels and the lesions including stenosis, infarct, aneurysm, hemorrhage, and so on. Meanwhile, when cerebral angiography clarifies thromboembolism and cerebral infarction, treatment such as emergency vascular thrombolysis and stent implantation can also be performed simultaneously after the examination. Cerebral angiography has an irreplaceable role in the diagnosis of cerebrovascular diseases, and it is recommended to follow the doctor’s instructions for examination and treatment.