Wearable devices mainly use built-in or additionally installed software to capture physiological signals and then feed them back to the wearer, which can quickly let the wearer know the current physical health information, especially with the development of smart phones. People can see the physical condition in real time and make timely adjustments. Wearable devices such as various health bracelets are becoming more and more popular, and they can be easily purchased in physical stores or online shopping, and more and more functions, ranging from step management, motion track tracking, sedentary reminder, calculation of calories, to dynamic heart rate monitoring, blood pressure measurement and sleep management, etc., various health management functions are becoming more and more diverse, but this has also made people curious, what is the difference between the physiological data monitored by a bracelet related to the hospital's precision instruments in management?