Objective The European System for Cardiac Operative Risk Evaluation (EuroSCORE) is a co mmonly used risk model worldwide for the predicting mortality after cardiac surgery and the Sino System for Coronary Operative Risk Evaluation (SinoSCORE) is a new risk stratification model developed using Chinese multicenter database.We compared the Sinoscore and the Euroscore with regard to their validity to predict in-hospital mortality after coronary bypass grafting (CABG) in a single-centre patient population of China.