Subjects are asked to rest quietly for at least 5 minutes before starting to measure blood pressure in the sitting position on the upper arm, which should be placed at the level of the heart. The use of validated upper arm medical electronic sphygmomanometers is recommended, and mercury column sphygmomanometers will be phased out. Use a standard size cuff (airbag length 22-26cm, width 12cm), obese people or people with large arm circumference (>32cm) should use a large size airbag cuff. Blood pressure should be measured on both upper arms at the first visit, with the side with the higher blood pressure reading as the upper arm for measurement. Blood pressure measurements should be repeated 1-2 minutes apart and the average of the 2 readings recorded. If the difference between the 2 readings of SBP or DBP is more than 5 mmHg, the measurement should be repeated and the average of the 3 readings recorded. Standing blood pressure should be added to the measurements in the elderly, diabetic patients, and those with postural hypotensive conditions. Standing blood pressure should be measured at 1 and 3 minutes after changing from the prone to the standing position. 1. Pulse rate should be measured at the same time as blood pressure measurement. 2. Evaluation of various blood pressure measurement methods 3. In-office blood pressure is the common method in China for diagnosing hypertension, grading blood pressure levels and observing the efficacy of antihypertensive therapy. If there are conditions, blood pressure measurement should be carried out outside the clinic for diagnosing white coat hypertension and hidden hypertension, evaluating the efficacy of antihypertensive treatment, and assisting in the diagnosis and treatment of refractory hypertension. 4. Ambulatory blood pressure monitoring can assess 24-hour circadian rhythm of blood pressure, postural hypotension, postprandial hypotension and so on. Home blood pressure monitoring can assist in adjusting the treatment program. Internet-based remote real-time blood pressure monitoring is a new mode of blood pressure management. Frequent self-testing of blood pressure is not recommended for patients with high mental anxiety.