The conversion relationship between blood pressure kpa and mmhg is 1mmhg = .133kpa and 1Kap＝7.5mmHg. At present, in clinic, millimeter mercury is usually used as the most commonly used blood pressure unit in literature, guide and textbook. In the past, mercury sphygmomanometers used millimeters of mercury as the prompting unit for blood pressure reading, while electronic sphygmomanometers can be kilopascals or millimeters of mercury because of different settings. Therefore, before measuring blood pressure, it is generally necessary to adjust the electronic sphygmomanometer to the unit of millimeter mercury, so as to read the measured value of blood pressure more intuitively.