Disease prevention is to prevent the occurrence of diseases in the population, and prevention refers to some measures before the occurrence of diseases. The occurrence and development of each disease has its own rules, and three-level prevention strategies and measures can be taken. The first level of prevention measures is to prevent the occurrence of diseases, and the second and third level of prevention measures are to control the development of diseases. Disease prevention includes individual prevention and group prevention, which study the health and disease status of individuals and groups respectively, as well as the individual and group effects of disease prevention and health promotion. Individual prevention refers to the measures taken to prevent diseases in individuals. In ancient times, people have recognized that the occurrence of health and disease is closely related to external factors, and created many methods to prevent disease and protect their own health. For example, the use of fire not only shortened the process of digesting food, but also reduced the occurrence of poisoning and gastrointestinal diseases; Hua Tuo, a famous doctor in the Eastern Han Dynasty, created the Five Animal Play to imitate animal movements to strengthen the body. The progress of western science and technology in modern times, such as the invention of cattle pox by Czerner and the pathogenic disinfection method by Pasteur, has played a great role in the prevention and control of diseases. It is increasingly recognized that encouraging individuals to participate and take more responsibility for their health is the key to the effectiveness of disease prevention. Strengthening health awareness and establishing good lifestyle and behavioral habits are important aspects of individual disease prevention. It is important to have a balanced diet, to limit the intake of high fat, high protein, high sugar and high salt, to control body weight and not to eat unclean food. It is important to strengthen physical exercise and maintain a stable lifestyle. Drink alcohol in moderation or not, avoid smoking, and prevent drug dependence and drugs. To acquire knowledge of self-care and avoid accidental injuries in life and production. To overcome character weaknesses, promote pleasant and positive emotions, improve the ability to tolerate and resolve major events, and strengthen harmonious interactions with social groups.