Abstract: Objective To study the impact of different thyroid hormone levels on the early results after coronary artery bypass grafting(CABG) in euthyroid subjects by reviewing retrospectively the postoperative complications. Methods The data of 622 male patients undergoing CABG in our hospital between July,2010 and March,2014 were reciewed.The 311 patients with lower-Thyroid hormone level(FT₃:1.79-2.93 pg/ml) were assigned into in the L group,while another 311 male cases with higher-Thyroid hormone level male (FT₃:2.94-4.09 pg/ml) matched with age and left ventricular ejection fraction were assigned into H (control) group.The mechanical venitation time,length of ICU stay,length of stay after operation,new happened stroke,myocardical infartion,mortality,atrial fibrillation,hemodialysis,acute kidney injury,tracheotomy,aligent arrhythmia,intra-aortic balloon pumping(IABP) implant were comparative analyzed. Results The length of stay after operation longer in group L[6 days(6,9)] was more than that in the control[6 days(6,9)](Z=4.159,P<0.05).The IABP implant(2.6%) and incidences of acute kidney injury(17.7%) in group L were higher those(0.3% and 9.00%) in Group H(χ²=5.524,10.136,P<0.05).The incidences of new happened stroke,myocardical infarction,mortality,atrial fibrillation,hemodialysis,maligent arrhythmia,tracheotomy were not statistically significant between the two groups(P>0.05). Conclusion The lower-thyroid hormone level can significantly impact the early results after CABG.