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Objective:To obtain early results of off-pump coronary artery bypass grafting(OPCAB) in patients with significant left main coronary artery(LMCA) and triple vessels stenosis by comparing with those of a similar group undergoing conventional coronary artery bypass surgery(CCAB). Methods:Data for patients with significant LMCA and triple vessels stenosis who underwent CCAB or OPCAB were collected retrospectively between January I999 and May 2006. Non-randomized, retrospective data analysis included demographic and preoperative risk factors, operative details, clinical outcome and early follow-up. Results: The number of distal anastomosis and grafts varied from 3 to 6. The average number per patient was similar in the two groups (OPCAB group:3.76±0.98, CCAB group:3.81±1.02). Thirty-day mortality occurred to one patient in the OPCAB group whereas two early deaths were observed in the CCAB group but did not reach statistical significance (P＞0.05). The frequency of atrial fibrillation (AF), IABP usage, mediastinitis,re-operation for bleeding (or tamponade) were similar in the two groups (P＞0.05). Postoperative inotropic requirements, peak CKMB, ventilation time, blood loss, FFP, RBC transfusion need and the length of ICU-stay were all significantly lower in thc OPCAB group compared with CCAB group(P＜0.05).Conclusion: Significant LMCA and triple-vessel stenosis can safely and effectively undergo myocardial revascularization using OPCAB surgery. LMCA should no longer be seen as a contraindication to perform OPCAB grafting.