Diabetic coronary heart disease patients have a great difference in life expectancy, if the control is better, there may not be too much impact, if the coronary artery severe stenosis or occlusion, combined with acute large myocardial infarction, can be life-threatening. If the diabetes mellitus coronary heart disease is mild, the degree of coronary artery atherosclerosis is light, no obvious stenosis, usually good control of blood glucose, blood pressure, blood lipids, regular life, the survival period can be relatively long. Diabetes mellitus diabetic coronary heart disease is serious, coronary artery severe stenosis or occlusion, resulting in acute myocardial infarction, and for large myocardial infarction, combined with heart failure can be life-threatening. Diabetic patients should actively control blood glucose, blood pressure, blood lipids, delay the development of complications.