Blood pressure is one of the vital signs of a person, and a correct reading of blood pressure is essential to assess and predict a patient’s condition. There are two units of blood pressure measurement: mmHg (millimeters of mercury) and Kpa (kilopascals), with a conversion relationship of 1 mmHg = 0.133 Kpa, and both measures are marked on both sides of the mercury column of the sphygmomanometer. The World Health Organization used to require the uniform use of Kpa as the unit of blood pressure measurement, but in practice, due to the long history of traditional use of millimeters of mercury counting units, the use of Kpa as the unit of blood pressure measurement is not as good as the use of mmHg to reflect the small changes in blood pressure and more accurately reflect the blood pressure level, and now the most used and spoken communication in the clinic is still mmHg, there is no need to There is no need to forcibly convert.