Abstract: Objective To explore the risk factors correlated with post CABG (coronary artery bypass grafting)inpatient mortalitycases. Methods Data obtained from27clinical cases was first evaluated using SinoSCORE to justify surgical risks and then was analyzed with retrospective methodology.Statistical analysis was employed to analyze fatal complication, death time, and clinical risk factors. Results Atotal of 1146 cases was analyzed. Results from SinoSCORE evaluation showed that 6 cases were categorized as low risk level, while 5 were within moderate level, and 16 cases at a high risk level. Among 1146 cases, a 2.36% mortality rate was detected. Additionally, 3 cases occurred during the surgery, 5 cases occurred within 48h after the surgery (caused by circulatory failure), and 19 cases occurred after 48h of the surgery (caused bymultiple organ failure due to functional failure in both lung and renal). The main reason in elder women death cases was due to lung function failure caused by pulmonary infection. Conclusion TheSinoSCOREevaluation system provided indicated a predictive effect for the surgical results. The main reason of deaths was caused by the functional failure of heart, lung and cerebrum. Patient based precaution should be aware during the CABG perioperative period in order to provide individualized treatment.