Hypertension, defined as intermittent or continuous blood pressure exceeding 140/90 mmHg, is one of the most common cardiovascular diseases in clinical practice today and can be associated with functional or organic damage to the heart, brain, kidneys, and other organs as a clinical syndrome. Generally, blood pressure can be measured by clinical manifestations as well as regularly with a blood pressure monitor, and the category of hypertension can be clarified according to specific values. I. Judgment according to clinical manifestations Patients with persistent or recurrent headache, dizziness, tinnitus, inattention, memory loss, numbness of limbs, increased nocturia, palpitations, chest tightness, weakness and other symptoms, which are aggravated after stress or exertion, should be alert to the possibility of hypertension. Second, according to the measured blood pressure values 1, normal blood pressure: systolic blood pressure <120mmHg and diastolic blood pressure <80mmHg; 2, normal high value: systolic blood pressure 120-139mmHg or diastolic blood pressure 80-89mmHg; 3, hypertension: systolic blood pressure ≥140mmHg, and/or diastolic blood pressure ≥90mmHg; 4, grade 1 hypertension: systolic blood pressure 140- 159mmHg, and/or diastolic blood pressure 90-99mmHg; 5. Grade 2 hypertension: systolic blood pressure 160-179mmHg, and/or diastolic blood pressure 100-109mmHg; 6. Grade 3 hypertension: systolic blood pressure ≥180mmHg, and/or diastolic blood pressure ≥110mmHg; 7. Simple systolic hypertension: systolic blood pressure ≥140mmHg and diastolic blood pressure < Third, the prevention of hypertension 1, maintain optimism: avoid cardiovascular disease related negative psychological factors, pay attention to mental and emotional regulation, maintain optimism, open-mindedness; 2, improve dietary habits: reduce the intake of saturated fatty acids and cholesterol food, less salt and sweets, eat more vegetables and fruits, pay attention to dietary diversity; 3, moderate exercise: moderate exercise can promote blood circulation, reduce cholesterol production, prevent hypertension. Reduce the production of cholesterol and prevent the occurrence of hypertension. 4, avoid obesity, maintain a standard weight.