”I’ve been diabetic for more than ten years, and some time ago I always felt tightness in my chest, and I was stuffy when I climbed the stairs, so I came to the hospital for examination, and the doctor said it was coronary heart disease,” asked a puzzled Ms. Zhang, “I’m obviously diabetic, how can I have coronary heart disease again? This woman’s case is not uncommon in clinical practice, suffering from a long course of diabetes, such as poor control, prone to a variety of complications, the most common of which is cardiovascular disease. Diabetes is mainly a disorder of sugar metabolism, accompanied by protein and fat metabolism disorders, and even water and salt metabolism and acid and base imbalance. These metabolic disorders are the basis for the occurrence of atherosclerosis, so diabetic patients are prone to atherosclerosis, which thickens the cardiovascular wall and narrows the lumen, often causing impaired blood circulation and leading to the occurrence of cardiovascular disease. As early as 1999, the American Heart Association included diabetes as a major risk factor for coronary heart disease, alongside with dyslipidemia, hypertension and smoking; in 2001, the third report of the National Cholesterol Education Program Adult Treatment Group clearly elevated diabetes as an equal risk for coronary heart disease, i.e., the risk of new cardiovascular events is the same for diabetic patients and coronary heart disease patients within 10 years. The data show that nearly half of diabetic patients have co-morbid coronary heart disease. Diabetics are five to seven times more likely to suffer a myocardial infarction than normal people. Cardiovascular disease is a systemic disease, the onset of which is the result of the interaction and accumulation of multiple risk factors such as lifestyle, dietary habits, blood pressure, lipids, blood sugar, etc. Diabetic patients should control risk factors comprehensively to protect their cardiovascular. Diabetic patients should lower their blood pressure to meet the standard, in order to minimize the total risk of cardiovascular disease morbidity and mortality. The most important thing in prevention is to control blood glucose, as well as blood lipids, etc. Even if a diabetic patient does not show any complications, it is advisable to have a comprehensive relevant examination once a year, including electrocardiogram, electroencephalogram, fundus examination, microprotein examination of urine, and examination of lower limb vascular lesions. At the same time, a reasonable dietary structure and physical exercise should be added to reduce the incidence of coronary heart disease.