Hypertension class I is defined as systolic blood pressure of 140-159 mmHg and/or diastolic blood pressure of 90-99 mmHg; very high risk, also called very high risk, is the result of risk stratification of hypertensive patients, and the higher the risk stratification, the greater the risk of future cardiovascular events. Patients with very high risk of hypertension are those who have a combination of clinical complications of hypertension or diabetes mellitus. Patients with very high risk of hypertension need active antihypertensive treatment to keep their blood pressure below 130/80 mmHg for a long time. Patients with diabetes mellitus should actively control their blood glucose level, and also actively improve their lifestyle and control other cardiovascular risk factors to prevent aggravation of the disease.