Objective：To study 9-year survival rate of undiagnosed diabetes patients with heart failure. Methods：All patients with first-time discharge diagnosis of acute heart failure in the cardiology department of our hospital received a retrospective cohort obser－vational study. Results:100 cases of the 65 patients died，48 patients of whom died of cardiovascular disease. Kaplan-Meier survival curves illustrated the clinical patients with diabetes and asymptomatic diabetic patients had higher all-cause and cardiovascular dis－ease mortality risk.Asymptomatic diabetic patients were similar with clinical patients with diabetes in all-cause mortality risk ，and significantly higher than those without diabetes. Conclusion:We should pay more attention to the diagnosis of abnormal blood glucose for the inpatients with heart failure at admission.