Controlling blood pressure can significantly reduce the incidence of coronary heart disease. The blood pressure level of patients with coronary heart disease should be controlled below 140/90 mmHg. For people with diabetes and chronic kidney disease, the blood pressure should be lowered to below 130/80 mmHg, but it should not be lowered to below 110 mmHg; too low blood pressure instead increases the occurrence of cardiovascular events. The treatment of hypertension is generally divided into non-pharmacological treatment and pharmacological treatment: patients with mildly elevated blood pressure can get their blood pressure down to a normal level simply by adjusting from quitting smoking and limiting alcohol, eating a low-salt diet, avoiding excessive stress and ensuring proper exercise; while those patients with excessively high blood pressure and combined with other diseases can use pharmacological treatment as appropriate when they cannot achieve the purpose of lowering blood pressure by changing their lifestyle habits The main antihypertensive drugs include diuretics. The main antihypertensive drugs include diuretics, beta-blockers, calcium antagonists, angiotensin-converting enzyme inhibitors, angiotensin II receptor antagonists, and many others. The principles of choosing antihypertensive drugs for hypertensive patients with combined coronary artery disease are: (1) Smooth antihypertensive: antihypertensive drugs do not have immediate effect, and it usually takes two to three months to achieve the best effect. (2) Combination of drugs: Because several antihypertensive drugs have their own advantages and disadvantages, different mechanisms of action, indications and side effects are also different, the efficacy of its single drug is about 50%, so usually need to combine drugs to avoid shortcomings. (3) Long-term use: Even if the blood pressure has been reduced to normal values, the drug should not be stopped without authorization.