Objective：To study risk factors of aneurysmal subarachnoid hemorrhage（subarachnoid hemorrhage caused by intracranial aneurysms，aSAH） and to explore their relationship with clinical prognosis in order to provide references in clinics. Methods：Clini－cal data of 87 cases of aSAH from January 2007 to December 2009 in department of neurology were collected and statistical analysis was made on patients’ general information，characteristics of aneurysm and APACHEⅡ scores. Results：Single factor analysis showed that patients’age，aneurysm size，multiple aneurysms or not，blood pressure，cerebral vasospasm，rebleeding，APACHEⅡscore，Hunt-Hess classification were significantly correlated with clinical prognosis. Logistic regression showed that aneurysm size，cerebral va－sospasm，rebleeding，APACHEⅡscore，Hunt-Hess classification were significantly correlated with prognosis of aSAH. Conclusions：Patients’ aneurysm size，cerebral vasospasm，rebleeding，APACHEⅡ score and Hunt-Hess classification are significantly correlated with prognosis of aSAH；the predication of these indicators is of great importance in reducing mortality and morbidity of aSAH.