In China, cerebrovascular disease has also become a major disease that endangers the health and lives of middle-aged and elderly people. It is estimated that the annual cost of stroke treatment is about 12 billion RMB, which has become an increasingly heavy financial burden. In addition, the recurrence rate of stroke is very high, with an average annual recurrence rate of about 4% and a cumulative recurrence rate of up to 40% within 10 years. Once a stroke occurs, it can cause irreparable damage, so prevention is especially important. Almost all studies at home and abroad have confirmed that hypertension is the most important risk factor for stroke, and both systolic and diastolic blood pressure are directly, consistently, and independently associated with the risk of ischemic stroke. For the Chinese population, blood pressure is more strongly associated with stroke than blood pressure is with other cardiovascular events. In China, studies have shown that for every 10 mm Hg increase in systolic blood pressure (1 mm Hg = 0?133 kPa), the relative risk of stroke increased by 49%; for every 5 mm Hg increase in diastolic blood pressure, the relative risk of stroke increased by 46%, after controlling for other risk factors. The importance of blood pressure control is most prominent in the prevention of stroke. A meta-analysis of large studies showed that lowering diastolic and systolic blood pressure reduced the incidence of stroke by 42%, and in older patients with systolic hypertension alone, lowering blood pressure reduced the incidence of stroke by an average of 30%. Hypertension is also an important risk factor for reoccurrence of stroke. Patients with blood pressure levels above 160/100 mmHg are at significantly increased risk of stroke recurrence. Patients with a history of hypertension after a first stroke should be monitored closely, regardless of their previous history of hypertension. Therefore, in stroke prevention, it is important to lower blood pressure, especially systolic blood pressure, to the right level. Therefore, to prevent stroke, it is important to increase the rate of self-awareness of hypertension, the rate of reasonable medication and the rate of blood pressure control. Patients with hypertension should consume less than 6 grams of salt per day, eat a reasonable diet, stop smoking and limit alcohol consumption, and get enough sleep. For general hypertensive patients, blood pressure should be controlled below 140/90 mmg; for hypertensive patients with diabetes mellitus and hypertensive patients with cerebrovascular disease, blood pressure should be controlled below 130/80 mmHg; for patients with kidney damage, blood pressure should be controlled below 125/75 mmHg. At present, there are six main categories of antihypertensive drugs, namely: diuretics, beta-blockers, angiotensin-converting enzyme inhibitors (ACEI), angiotensin II receptor antagonists (ARB), calcium antagonists, and alpha-blockers. The first five classes are the first-line antihypertensive drugs. In clinical treatment, when the effect of a single drug is not good, a combination of drugs is often used.