Intracranial aneurysms are the most common cause of spontaneous subarachnoid hemorrhage (SAH). Cerebral arteriography is the “gold standard” for the diagnosis of aneurysms. Rebleeding from aneurysms is the leading cause of death and disability, with the highest incidence occurring on the first day after SAH. Delay in surgical treatment is sufficient to create a time window for rebleeding, and clinically vasospasm rarely occurs within 3 days of SAH. Consequently, cerebral angiography and timing of surgery in patients with SAH are now significantly different from the past: that is, early angiography and performance of early (≤96 hours) or ultra-early (usually within 72 hours) aneurysm clamping are advocated. The aim of surgical treatment is to minimize the risk of rebleeding and to facilitate the treatment of vasospasm. (A) Indications for surgery 1, diameter ≥ 10mm unruptured aneurysm. 2.After subarachnoid hemorrhage of aneurysm, if the patient’s general condition is still good and neurological status is stable (Hunt&Hess grade ≤ III), early surgery can be performed (≤ 96 hours). 3.A large hematoma with occupying effect after subarachnoid hemorrhage should be operated as early as possible. 4, CT scan found obvious cerebral edema, accompanied by the manifestation of persistent vasospasm and Hunt&Hess classification ≥ grade III, should be selected for surgical treatment after stabilization of the condition and improvement of neurological function. (The ideal surgical treatment goal is to place an aneurysm clip to clamp the aneurysm neck and exclude the aneurysm from the circulation without causing stenosis or occlusion of the aneurysm-carrying artery and residual aneurysm. The procedure should be performed according to the patient’s clinical condition, the anatomic location, size and complexity of the aneurysm, and the surgeon’s skills. In recent years, minimally invasive surgery, including navigation systems and endoscopic assistance, is being progressively developed, further improving the therapeutic effect. Recommendations: In principle, early angiography should be performed in patients with SAH, and early surgery should be performed for detected intracranial aneurysms, but it should be performed in accordance with the patient’s clinical condition and specific medical conditions.