Subarachnoid hemorrhage refers to the flow of blood into the subarachnoid space after the rupture of intracranial blood vessels, and the best time for resuscitation is related to its etiology. Subarachnoid hemorrhage can be caused by a variety of causes, including aneurysm and cerebrovascular malformation rupture, etc. Patients mainly present with acute onset of severe headache, vomiting, impaired consciousness, and even respiratory and cardiac arrest, and about 10-15% of patients die before reaching the hospital. If the hemorrhage is caused by aneurysm, craniotomy or interventional embolization should be performed within 3 days; if the hemorrhage is caused by rupture of cerebrovascular malformation, craniotomy or interventional embolization or gamma knife treatment can be performed after the hemorrhage is absorbed and the condition is stable, and the absorption time of the hemorrhage is usually about 2 weeks. Patients with subarachnoid hemorrhage usually present with pioneering symptoms such as headache, dizziness and cranial nerve palsy days or weeks before. Therefore, patients are advised to go to the neurology or neurosurgery department of the hospital promptly when symptoms appear so as not to delay the condition.