Objective The incidence of coronary artery bypass grafting surgery (CABG) in elderly patients has been increasing.There are contradictory reports on the early outcome of elderly coronary artery patients as compared with their young counterparts.The aim of this retrospect study is to analyze the results of isolated on-pump coronary artery bypass graft surgery (CABG) in patient≥ 70 years-old.Methods 312 Patients undergoing isolated on-pump CABG from Jan 2008 to Dec 2012 were divided in two groups: GE (elderly=≥ 70 years-old, n=118) and GY (adults< 70 years-old, n=194).Preoperative data, intraoperative (as cardiopulmonary bypass time, aortic clamping time, time length of stay in mechanical ventilation--MV--and number of grafts), and postoperative variable (as morbidity, mortality and time length of stay in hospital) were analyzed during hospitalization.Results In GE, the LOIS was longer than in GA (5.1± 2.3 vs.4.5±1.9, P=0.013), smaller BSA,(1.64± 0.14, 1.77± 0.18 m2 P=0.000), higher occurrence rate of ICU delirium (21.2% vs.8.8% P=0.003),Mechanical Ventilator support more than 5 days (7.1% vs.1.6%, P =0.022),First day post operativemediastinal drainage amount (713.7ml ± 480.8 vs.577.5 ± 387.6ml P=0.013), EurScore (7.0±2.8 vs 4.2±3.5 P=0.000), higher prevalence of COPD (9.3% vs.2.1% P=0.004), but there was no difference in the mortality rate (5.9% vs.3.1%, P=0.251).Prevalence of DM (45.8% vs.562%, P=0.074) and Hypertension (75.4% vs.74.2%, P=0.814), There was no difference between the groups regarding intraoperative variables.After multivariate analysis, age ≥70-year-old was associated with greater morbidity, but it was not independent predictive factor for in-hospital mortality.Conclusion This study suggests that patient ≥70-year old were at increased risk of postoperative complications when submitted to isolated on-pump CABG in comparison to patients < 70-year-old CABG in the elderly patients had certain surgical risks such as chronic obstructive pulmonary disease, occurrence rate of ICU delirium, and postoperative complications such as pulmonary complications, more postoperative bleeding and blood transfusionin the elderly than in the younger patients but not under increased risk of death.