Objective To study the possible reasons for dramatic decrease of in-hospital re-bleeding of intracranial aneurysms by comparison between different time periods. Methods The data of patients with aneurysmal subarachnoid hemorrhage were analyzed retrospectively in this study who underwent treatment at Neurosurgery Department of West China Hospital in two periods, including January 2005-December 2008 (458 cases) and January 2013-December 2014 (1 446 cases). The patient's age, gender, Hunt-Hess grade, systolic blood pressure, history of anti-fibrinolytic medication, aneurysm location, admission waiting days, surgery waiting days and total hospital stay were compared between the two groups. Their relations to re-bleeding rate were analyzed. Results In the 2005-2008 group, the re-bleeding rate was 13.8% (63/458), and it was 2.8% (40/1 446) in the 2013-2014 group. The difference was statistically significant (P 0.05). Conclusion Efficient management of aneurysms might greatly decrease the rate of in-hospital re-bleeding and lead to better outcomes. Key words: Intracranial aneurysm; Subarachnoid hemorrhage; Risk factors; Controlled clinical trials