Coronary heart disease is one of the most important diseases that endanger human health. It is caused by various harmful factors that damage the endothelial cells of coronary arteries, resulting in coronary atherosclerosis, which further leads to narrowing and even occlusion of blood vessels. Clinically, angina pectoris, myocardial infarction and even sudden death occur. Hypertension, hyperlipidemia, hyperglycemia and smoking are the four main culprits of coronary heart disease. 1, hypertension is an independent risk factor for coronary heart disease: a large number of studies have shown that hypertension can damage the arterial endothelium and cause atherosclerosis, and accelerate the process of atherosclerosis. The higher the blood pressure level, the heavier the degree of atherosclerosis, the higher the risk of dying from coronary heart disease. 2, hypertension can cause myocardial infarction: when there is coronary artery lesion, elevated blood pressure may trigger atherosclerotic plaque rupture, thrombus formation, blocking the coronary arteries, leading to acute myocardial infarction. The incidence of myocardial infarction is twice as high in hypertensive patients as in normal subjects, and hypertension increases the risk of acute myocardial infarction. The increase in immediate and long-term mortality after infarction may be due to the increase in serious complications of myocardial infarction due to hypertension. For example, cardiac rupture (left ventricular free wall, ventricular septum, papillary muscle) during acute myocardial infarction is common in up to 53% of hypertensive individuals. Therefore, good control of hypertension can prevent coronary heart disease, reduce coronary heart attack and can prevent the occurrence of unexpected events. 3, hypertensive patients with acute myocardial infarction when the blood pressure can be suddenly reduced, and some other hypertensive patients when the myocardial infarction, due to reduced cardiac function so that blood pressure no longer rise.