At the 2022 China International Trade in Services Fair held not long ago, many visitors experienced a mini "ECG" - Zhirou ECG paste in the health service special exhibition area. It is light and compact, can be worn with you, can monitor dynamic ECG data in real time, and achieve multi-dimensional measurement and timely warning. At the exhibition, similar new wearable devices attracted the attention of people of different ages. With the accelerated aging process of the global population and the increasing number of chronic patients, wearable devices are increasingly used in the medical and health field. According to statistics, the global sales volume of wearable health devices will be about 200 million in 2020, which is expected to double by 2026. Huawei, Apple, Samsung and other consumer electronics enterprises have released watches with health monitoring functions; Medtronic, Abbott and other medical device giants have also listed smaller and more intelligent wearable continuous blood glucose monitoring devices and "artificial pancreas". There are various kinds of wearable health devices, such as smart watches, smart bracelets, smart necklaces, smart headphones, smart glasses, smart clothes, even smart skin, smart muscles, etc. Their common characteristics are that they are centered on human life, characterized by "wearability" and aimed at "health". Compared with traditional wearable devices, such devices integrate multimodal sensors, on-chip processing algorithms, 5G/Bluetooth communication modules, artificial intelligence algorithm models, etc., involving computer, electronic communications, biomedical engineering, clinical medicine and other interdisciplinary, and are also the result of long-term cooperation between scientific research institutions, enterprises, hospitals and other institutions, with a high threshold for research and development. In terms of function, they can not only monitor the physiological indicators or physical status such as heart rate, blood oxygen, respiration, blood pressure, sleep, and fall, but also gradually include psychological indicators such as psychological stress and fatigue. With the continuous improvement of accuracy, wearable health devices can be used for early screening of heart disease, diabetes, hypertension, depression and other diseases, and can also play a health warning and risk assessment function to help people find health hazards in time by monitoring the frailty index, obesity index, hypoglycemia risk, fatigue sudden death risk, etc. In addition to monitoring and early warning, the function of wearable health devices will also be extended to intervention and management. Like a 24-hour "health butler", they will timely intervene in pain, nightmare, myopia and weight, provide rehabilitation training guidance and blood glucose and blood pressure management, and "supervise" users to develop a healthy lifestyle. At the same time, wearable health devices will also serve as doctors' "helpers" to improve the compliance rate of patients outside the hospital, reduce the number of patients' medical visits and reduce the cost of medical treatment. Around these goals, wearable health devices are actively developing applications and innovative practices. In the future, there is infinite imagination space. From personal living to athlete training and competition, from deep-sea diving to space navigation, from primary school students to the elderly, wearable health devices will protect people's health in multiple scenes and terminals. At present, wearable health devices still have many technical challenges to overcome. First of all, due to the diversity of application scenarios and the personal differences of human bodies, it is difficult to unify the wearing requirements of various devices, and the acquired data are accurate and consistent