Abstract: Abstract Objective: To investigate the characteristics of patients with unprotected left main artery(UPLMA) disease and their relationship to EUROscore, coronary SYNTAXscore score.Methods: Clinical data of 75 patients’ with UPLM disease were retrospectively collected between January 2006 and July 2010 from the Department of Cardiology, Tianjin Chest Hospital. EUROscore, SYNTAXscore and their relationship with clinical characteristes were investigated.Results: SYNTAX Score is correlated with the EUROscore (r = 0.368, P<0.05), LVEF(r=-0.282，P<0.05); and LVDD(r=0.281，P<0.05).Conclusion：Both SYNTAXscore and EUROscore can serve as risk assessment in patients with left main disease.

Key words: Unprotected left main coronary disease, percutaneous coronary intervention, EUROscore, SYNTAXscore