Clinically, we often find some hypertensive patients, although they are also taking anti-hypertensive drugs, but due to poor blood pressure control, finally lead to brain hemorrhage, which brings great misfortune to individuals and families. So how much blood pressure control is appropriate? The Chinese Hypertension Prevention Guide (2005) recommends that blood pressure in general hypertensive patients should be strictly controlled to below 140/90 mmHg; in patients with diabetes and kidney disease, blood pressure should be reduced to below 130/80 mmHg; and in elderly people, systolic blood pressure should be reduced to below 150 mmHg, and can be further reduced if tolerated. The guidelines also suggest that: blood pressure levels start at 110/75 mmHg, and the risk of cardiovascular morbidity continues to increase as the blood pressure level rises, compared with blood pressure <110/75 mmHg, the risk of cardiovascular morbidity increases 1-fold at blood pressure 120-129/80-84 mmHg, and 2-fold at blood pressure 140-149/90-94 mmHg. Therefore, we understand that the ideal blood pressure should be 110/75mmHg. If we only lower the blood pressure to below 140/90mmHg, for example, 139/89mmHg level, it is just a barely passable level of the upper target value, and we should try to lower the blood pressure to benefit more. Blood pressure levels of 120-139/80-89mmHg are considered "pre-hypertension" in the United States and "normal high" in our guidelines, in short, they are considered to be outside the normal range. However, it is not the case that the lower the blood pressure, the better, to avoid prolonged blood pressure below 90/60mmHg, too low blood pressure is not good for the body, can lead to some ischemic pathological changes, this point should also be very careful.