Prevention is divided into three levels, primary prevention refers to prevention without the onset of disease, secondary prevention refers to prevention after the onset of disease, and tertiary prevention refers to prevention of complications after the onset of disease, of which secondary prevention is the most significant, relying on secondary prevention outside the United States over the past 30 years to improve the average life expectancy by 4.6 years. The main preventive drugs are aspirin, betalactam, lipid-lowering drugs, etc. Our clinical emphasis on treatment rather than prevention is the main reason for the high recurrence rate of cardiovascular disease in China. That is, to reduce the risk of coronary heart disease in a population without evidence of coronary heart disease. The main purpose is to control the susceptible factors and prevent the formation of atherosclerosis in the susceptible population. Prevention of coronary heart disease 1, do not smoke. 2, maintain normal and stable blood pressure, the ideal blood pressure is 120/80mmHg. Prevention and control measures of hypertension include maintaining normal weight, limiting alcohol, salt intake, maintaining appropriate potassium, calcium and magnesium intake, and taking antihypertensive drugs under the guidance of a doctor. 3, maintain normal blood lipids, prevention and control of hyperlipidemia, high-risk groups should be regular checkups, low-fat diet, exercise, and take lipid-lowering drugs. 4, avoid mental tension. 5, too little exercise lifestyle is an important risk factor for coronary heart disease, regular exercise helps to maintain weight, reduce hyperlipidemia and hypertension, the occurrence of coronary heart disease. 6, to maintain normal blood sugar, prevention and control of diabetes. 7.For high-risk patients who have coronary heart disease risk factors (hypertension, diabetes, hyperlipidemia, etc.), it is recommended to take cardiac blood to prevent the occurrence of coronary heart disease for a long time.