Objective The timing of definitive aneurysm treatment (coiling or clipping) in subarachnoid hemorrhage (SAH) patients has been a controversial topic.The purpose of this retrospective study is to analyze whether ultra-early coiling of ruptured intracranial aneurysms improves the clinical outcomes of SAH patients.Methods One hundred and fifty-eight patients with ruptured intracranial aneurysm induced SAH,admitted to our hospital from February 2012 to February 2017,were chosen in our study;80 patients were coiled within 24 h after SAH (ultra-early coiling group) and 78 patients were coiled ≥24 h after SAH (non ultra-early coiling group).The clinical data of these patients were retrospectively analyzed;the incidences of re-bleeding before embolization and postoperative complications,percentages of total embolization and number of patients with good prognosis were compared between the two groups.Results As compared with non ultra-early coiling group,ultra-early coiling group had lower incidences of re-bleeding before embolization (17.6％ vs.5％),postoperative cerebral infarction (16.2％ vs.6.2％) and hydrocephalus (25％ vs.10％),and higher percentage of total embolization (64.1％ vs.85.0％),with statistical differences (P＜0.05).The number of patients with good prognosis between the two groups showed no significant difference (P＞0.05).Conclusions Ultra-early coiling (＜24 h after SAH) of ruptured aneurysms can reduce the preoperative re-bleeding rate,post-operative cerebral infarction and hydrocephalus rates,but not influence the clinical outcomes of the patients.