Based on the introduction of the concept and characteristics of the wearable medical devices, the paper elaborates the development situation of wearable medical devices at home and abroad, focuses on the statement of the functions of wearable medical devices in medical practice including achieving dynamic monitoring, providing medical diagnosis data, finding out the causes of diseases, achieving early treatment of diseases, promoting medical level, improving medical techniques, and relieving the situation of medical resources shortage of China, and meanwhile analyzes the problems of wearable medical devices and the healthcare industry.