With the development of imaging technology, the diagnosis of cerebral aneurysm is becoming more and more accurate. Briefly, there are two kinds of examination means, one is non-invasive examination and the other is invasive examination. Non-invasive examinations mainly include: 1, electron computed tomography (good botched boiling fade grabbing Xi Nuo account butch CT); 2, magnetic resonance (MR); 3, CT angiography (CTA); 4, MR angiography (MRA). Invasive tests here refer to digital subtraction angiography (DSA) CT and MR are both tomographic scans of the brain, mainly observing the brain parenchyma, ventricles, brain pools, and subarachnoid space for abnormal signals, while CTA and MRA reconstruct the anatomy of the cerebral arterial system and can diagnose cerebral aneurysms up to 90% or more. These tests are non-invasive because they do not require a physician to perform surgery. DSA, on the other hand, is a surgical examination and is invasive. This test is done in a sterile catheterization room or operating room with the patient lying flat on the imaging table. The operator delivers the imaging catheter through the femoral artery puncture into the aortic arch under fluoroscopic surveillance, then selects the bilateral carotid and vertebral arteries respectively and injects the contrast agent under X-ray radiography to obtain images of each artery. The original angiogram is processed by computer to eliminate image interference from the skull and soft tissues and highlight the images of cerebral arteries alone, which is known as digital subtraction angiography. although DSA has certain trauma and risks, it is currently the gold standard for diagnosing cerebrovascular disease, providing not only detailed anatomical data of vascular lesions, but also hemodynamic information such as blood flow and circulation velocity. cTA or MRA for cerebrovascular disease are diagnosed with DSA diagnosis as the reference standard. In the past decade, DSA with 3D angiography workstation has gradually become popular in hospitals at all levels in China. It can accurately display the location, size, morphology, growth direction, anatomical relationship with the aneurysm-carrying artery, and whether it is combined with cerebral artery stenosis, plaque, spasm, etc., which has greatly improved our diagnosis and treatment of cerebral aneurysm.