Spontaneous subarachnoid hemorrhage (SAH) is a clinically critical syndrome caused by the non-traumatic rupture of blood vessels outside the brain tissue in the cranial cavity and the direct flow of blood into the subarachnoid space, accounting for about 10% of acute strokes, and is a very serious and life-threatening hemorrhagic cerebrovascular disease. Ruptured intracranial aneurysms are the cause of bleeding in 85-90% of patients. Other causes such as intracranial vascular malformations, smoker’s disease, intra-arterial entrapment, and dural arteriovenous fistula can also cause subarachnoid hemorrhage. Unruptured aneurysms are less dangerous to patients. 1/3 of patients with ruptured aneurysms die before coming to the hospital, 1/3 die during hospital treatment for various reasons, and only 1/3 of patients recover after treatment. The mortality rate of first rupture of aneurysm is 30%, the mortality rate of second rupture is 65%, and the mortality rate of third rupture is 90%. The factors that trigger aneurysm rupture 1/3 are strenuous activities, 1/3 are high blood pressure, smoking, heavy alcohol consumption, and emotional stress, and 1/3 of aneurysm ruptures occur at rest. SAH mainly starts with severe headache and is usually accompanied by nausea and vomiting, impaired consciousness, psychiatric symptoms, epilepsy, and actinic nerve palsy. Cranial CT examination is the most common method to diagnose SAH, and the earlier the examination is performed after the onset, the higher the positive rate. Then cerebral angiography (DSA) or MRA/CTA examination is performed as early as possible to clarify the presence or absence of aneurysm as well as the size, location and number of aneurysm in time to decide the treatment plan of aneurysm and prevent re-rupture of aneurysm. There are two methods of intracranial aneurysm treatment: open aneurysm clamping and vascular interventional minimally invasive spring coil embolization. These two methods have their own advantages and disadvantages. Open aneurysm clamping can identify the relationship between the aneurysm and the surrounding vascular nerves under the microscope, and it is possible to completely clamp the aneurysm, but the surgery itself brings more trauma and risk to the patient; endovascular interventional embolization treatment is less traumatic to the patient and has less impact on vascular spasm, but its treatment cost is higher and it is sometimes difficult to achieve complete embolization of the aneurysm neck. Aneurysm clamping Aneurysm embolization Aneurysm disappears after spring-ring interventional embolization of aneurysm Other factors that affect the outcome of treatment for patients with aneurysms are cerebral vasospasm and other complications such as hydrocephalus. In conclusion, aneurysm is a cerebrovascular disease with high mortality rate, high disability rate, complicated treatment process, long treatment time and high treatment cost, which needs clear understanding and active attention.