Only by mastering the correct method of measuring blood pressure will the resulting blood pressure values be accurate. Blood pressure measurement needs to pay attention to the following aspects: First, you should choose a certified upper-arm electronic blood pressure monitor, or desktop mercury column blood pressure monitor, and also need to regularly calibrate the instrument. Second, half an hour before measuring blood pressure to avoid smoking, drinking strong tea, strong coffee, can not hold urine, quiet rest for 5 minutes. Third, the measurement should be done in a seated position, with the feet flat on the ground and the body relaxed and without talking. The center of the upper arm cuff should be at the same level as the heart, the cuff should not be too tight or too loose, the lower edge of the cuff should be about two fingers above the elbow socket, and the stethoscope should not be tucked into the cuff. Fifth, the electronic sphygmomanometer can directly read the blood pressure value, the mercury column sphygmomanometer to read the value, the eyes should be level to the mercury column liquid surface.