China Cardiovascular Surgery Registry (CCSR) Study is a national database for coronary artery bypass grafting (CABG) and valve surgery performed in 87 hospitals with cardiovascular surgery volume > 100 per year. The aims of CCSR Study are: (i) report the characteristics of patient, the quality and evolvement of CABG and valve procedures in China, (ii) build and valid surgical risk assessment tools for Chinese population, (iii) provide databases for clinical studies, and quality improvement initiatives.