The difference between lying and sitting blood pressure measurement is mainly the body position, elbow placement, different values in postural hypotension, and the rest are the same. The patient who lies down for blood pressure measurement takes the lying position, and the elbow is placed at the level of the mid-axillary line; the patient who sits for blood pressure measurement takes the sitting position, and the elbow is located at the level of the 4th costal cartilage; the blood pressure measured lying down is higher than that measured sitting down in the case of postural hypotension. The rest, including the preparation before measurement, measurement steps and measurement results, were the same. 1. Pre-measurement preparation: communicate with the patient, make the patient relax, do not be nervous, and rest for 5~10 minutes in a quiet environment. 2. Measurement steps: Select the brachial artery for indirect blood pressure measurement, with the elbow as high as the right atrium, wrap the cuff of the sphygmomanometer around the upper arm, with the degree of elasticity appropriate to be able to put in 1-2 fingers, and perform blood pressure measurement according to the use of different sphygmomanometers. 3. Measurement results: lying and sitting blood pressure measurement, exclusion of postural hypotension, as long as the level of the elbow and the right atrium is high, the difference in blood pressure measurement results is not significant (<5mmHg). When the measurement of blood pressure is obviously abnormal, it is necessary to actively consult a doctor and follow the doctor's instructions for reasonable treatment.