The classification of hypertension and risk stratification are criteria often used in clinical diagnosis of hypertension. The classification of hypertension is based on the level of hypertension, which is mainly divided into three levels. Risk stratification is based on the grading of hypertension and differentiated according to the patient’s risk factors and medical history, and is divided into low risk, moderate risk, high risk, and very high risk. I. Classification of hypertension: Grade 1 hypertension refers to a systolic blood pressure of 140-159 mmHg, and/or a diastolic blood pressure of 90-99 mmHg. Grade 2 hypertension refers to a systolic blood pressure of 160-179 mmHg, and/or a diastolic blood pressure of 100-109 mmHg. Grade 3 hypertension refers to a systolic blood pressure ≥ 180 mmHg, and/or a diastolic blood pressure ≥ 110 mmHg. II. Risk stratification: 1. Specific stratification: (1) Grade 1 hypertension: patients at low risk if they do not combine risk factors as well as clinical disease; patients at intermediate risk if they combine 1-2 risk factors; patients at high risk if they combine ≥3 other risk factors or if the patient has damage to target organs; patients at very high risk if they have developed clinical complications or have combined diabetes; (2) Grade 2 hypertension: patients at intermediate risk if no risk factors are combined; patients at intermediate risk if 1-2 risk factors are combined; patients at high risk if ≥3 other risk factors are combined or if there is damage to target organs; patients at very high risk if clinical complications have developed or if diabetes is combined; (3) Grade 3 hypertension: patients at high risk if no risk factors are combined; patients at very high risk if 1-2 risk factors are combined; patients at very high risk if ≥3 risk factors are combined or The presence of target organ damage is defined as very high-risk patients; patients with combined clinical complications or combined diabetes mellitus are also very high-risk patients. 2. Relevant indicators: risk factors include hypertension, men > 55 years old, women > 65 years old, smoking, abnormal glucose tolerance, dyslipidemia, family history of early-onset coronary heart disease, abdominal obesity, hyperhomocysteinemia, etc. Target organ damage included left ventricular hypertrophy, plaque visible on carotid ultrasound, ankle brachial index less than 0.9, and microalbuminuria. Concomitant clinical complications refer to the presence of cerebrovascular diseases, such as cerebral ischemia and cerebral infarction; cardiac diseases, such as heart attack, angina pectoris, and heart failure; and renal diseases, such as diabetic nephropathy, impaired renal function, and elevated creatinine, as well as peripheral vascular disease and retinopathy.