119 patients with surgically treated intracranial aneurysm between December 18, 1984 and October 1997 were analyzed resulting in nine patients with intraoperative aneurysm rupture. These nine cases formed the basis of this study. The incidence of intraoperative aneurysm rupture was 7.6 per cent. The mortality was 33.3 per cent. In our institution, maneuvers used to control profuse hemorrhage include induced hypotension, suction dissection, and temporary clips at the parent vessels. Some controversies exist regarding the effect of timing of surgery on intraoperative aneurysm rupture and ischemic consequence from induced hypotension. The argument is whether early surgery, within 72 hours, increases the incidence of intraoperative aneurysm rupture.