The common cause of spontaneous subarachnoid hemorrhage is intracranial aneurysm rupture, or other causes such as atherosclerosis. It is recommended that cranial CTA or whole brain angiography be performed as soon as possible after stabilization to clarify the cause and determine the next treatment plan. Aneurysmal subarachnoid hemorrhage is a disease with high morbidity and mortality, about 12% of patients die before receiving treatment, 40% of hospitalized patients die within 1 month after hemorrhage, 1/3 of patients have neurological deficits, and only a small percentage have a good prognosis. If an intracranial aneurysm is detected, it can be treated by craniotomy or endovascular detachable spring coils. The location of the aneurysm is determined by the following conditions: 1) the location of the aneurysm, the anterior circulation saccular aneurysm tends to choose surgical clamping, and the posterior circulation aneurysm tends to choose embolization; 2) whether the hospital doctor is good at clamping or embolization, and choose the method that is good at it. 3, according to their own economic situation, clamping costs less, embolization costs more. The two methods have their advantages and disadvantages, clamping must open the skull, less recurrence; embolization does not need to open the skull, some patients recurrence, must be followed up and reviewed. Both can produce complications: rebleeding, cerebral vasospasm, hydrocephalus, etc. The following are pictures of cranial CTA followed by craniotomy for anterior communicating aneurysm clamping