Coronary heart disease, hypertension, diabetes, and chronic bronchitis are all chronic diseases. According to the current medical level, they cannot be cured, but the symptoms can be alleviated. The diagnosis of coronary heart disease relies on coronary angiography, which can also determine the degree of coronary artery stenosis. If the stenosis reaches a certain standard, stent implantation can be performed; if the stenosis standard is not reached, secondary prevention of coronary heart disease can be carried out, including the six aspects of ABCDE, namely antiplatelet, ACEI/ARB, and beta receptor. Blockers, control blood pressure, control blood lipids, quit smoking, adjust diet, treat diabetes, health education, exercise. Long-term drug treatment is sufficient. For patients who have received stents, secondary prevention of coronary heart disease is still required. Go to the hospital for regular follow-up visits to control all indicators within a reasonable range.