As an application software, it is legal. Briefly: Cloud health is a systematic project, and it is also a complex giant system spanning different industries such as electronics, communication, medical care, biology and software. It needs the guidance of the government and the entry and support of related industries. Medical Internet of Things equipment, digital hospitals, remote diagnosis, family smart doctors, smart medical care, electronic health records, etc. The application in China will become an important part of it. Cloud health will become a health management from cradle to grave, that is, a whole-person health management system, which records the causes of human diseases with accurate medical terms and is convenient for doctors to find problems. Every health-related information will be recorded in the form of data, from prenatal examination records to daily physical examination reports, real-time signs data, and the results of each doctor's consultation. According to these records, community doctors will help residents to carry out health management and remind residents what health matters to pay attention to. At the same time, the collection of massive health information of residents can also help the disease control department to carry out local epidemiological statistics, find some high-incidence diseases in various places, and carry out prevention and treatment of high-incidence diseases.