Accurate and standardized measurement of blood pressure is the key to the classification of hypertension and assessment of risk factors. To properly measure blood pressure you should know the following: 1. No alcohol or coffee, no strenuous exercise, a stable mind, and emptying of the bladder for 30 minutes prior to blood pressure measurement. Sit still and rest for 5-10 minutes. 2, the surrounding environment is suitable, appropriate space, suitable temperature, quiet environment, no noise. 3.Sitting position measurement requires preparation of a table at the height of the subject’s arm, and a chair with a backrest. 4, bare upper arm, tied cuff, the cuff should be kept at the same level with the heart. Excessive or too thick sleeves should not be rolled back up and accumulated on top of the cuff. 5, Each person should repeat the measurement 2 times, two times 1 minute apart, and take the average of the 2 readings as the blood pressure of the subject. If the measured value differs by >5mmHg, the measurement should be taken again and the average of the 3 readings should be taken. 6.The initial measurement can be taken on both upper extremities, and the side with high blood pressure should be selected as the upper extremity for blood pressure measurement. 7, the stethoscope chest piece plugged in the cuff under the arterial pulsation, the measured blood pressure value is lower than the measured value of the standard operation of the stethoscope chest piece not plugged in the cuff. 8, The blood pressure measured through the clothing is higher than that measured by the standard operation, while the blood pressure measured with the sleeve up is lower than that measured by the standard operation. There are also studies that show that if a layer of underwear with a thickness of <0.5cm is added to the arm and then checked, the results have little effect on the value of the test. 9.Measuring blood pressure immediately after taking off the shirt in winter can make the blood pressure rise by 3-5 mmHg. 10.There are seasonal differences in blood pressure, and blood pressure is higher in winter than in summer when the temperature is low.