”Prevention is the main focus” is one of the basic policies of health work in China. For the prevention of skin diseases and other diseases, we should also implement the “prevention-oriented” policy and establish a holistic concept. Prevent the emphasis on treatment rather than prevention, the emphasis on local rather than overall and the emphasis on rare diseases, rare diseases and light on common diseases, multi-morbidity one-sided view. Since then, the majority of medical workers in China have done a lot of prevention work, efforts to popularize the prevention and treatment of dermatological knowledge for all people, and widely carry out the leprosy survey, universal treatment work. With the improvement of people’s living standard, the demand for treatment and prevention of skin diseases, especially for patients with disfiguring skin diseases, is higher. Here we will only briefly describe some of the principles of prevention: 1, keep the skin clean and hygienic: often keep the skin clean and hygienic, which has a certain significance for the prevention of skin diseases. Usually actively participate in sports activities and exercise, moderate sunbathing, can enhance physical fitness to maintain skin health, improve the skin’s ability to resist disease. 2, skin aging and light skin disease prevention: avoid sun exposure, avoid eating photosensitive food and using photosensitive cosmetics, prohibit the use of photosensitive drugs; summer outings should play umbrella, exposed parts should apply sunscreen, etc. 3, pigmentation skin disease prevention: minimize the damage of ultraviolet light on the skin, should not be long-term use of harmful skin peeling agents or hormone preparations, avoid the use of poor quality cosmetics. At the same time should maintain a relaxed mood, regular life and adequate sleep. 4, the prevention of cosmetic skin disease: before using a certain unused cosmetics, it is best to conduct a patch test to help choose, do not blindly use a lot to avoid allergic reactions. Prohibit the use of poor quality or expired cosmetics, should not often heavy makeup, if indeed necessary, should also be cleaned when removing makeup. 5, prevention of skin diseases caused by excessive secretion of sebaceous glands: more common, such as acne, seborrheic dermatitis, etc., should mainly control the intake of fat, sugar, less spicy, fried food, often wash the affected area with warm water, avoid squeezing with hands. 6, pruritic skin disease prevention: to actively find the cause, advise patients not to scratch and external use of irritating drugs, do not use hot water to scald, prohibit alcohol, spicy stimulating food, to prevent aggravation and recurrence of skin disease. 7, the prevention of infectious skin diseases: for some infectious skin diseases, such as scabies, leprosy, sexually transmitted diseases, pyoderma, fungal diseases, skin bacterial infections, etc., the source of infection should be isolated and treated in a timely manner to cut off the path of infection, early detection, early diagnosis, early treatment, to prevent contact infection. At the same time should do a good job of health promotion and education, hygiene and change bad hygiene habits, to the patient to promote education about the prevention of infectious and epidemic skin diseases knowledge. 8, the prevention of allergic skin disease: allergens should be carefully searched for to avoid re-exposure or re-intake; prohibit the relevant allergenic drugs, including adult drugs or compound drugs containing allergenic drug components; avoid the use of heterogeneous protein food prone to allergic reactions, such as fish, shrimp, crab, eggs, etc.; unused cosmetics should be first small area trial, such as allergic performance, should be immediately discontinued, do not use reluctantly. For chronic urticaria and other skin diseases with complex causes, we should carefully search for allergens and try to remove them. 9, the prevention of occupational skin diseases: carry out a survey of the pathogenic factors in the work environment, the work exposure to chemical, physical and biological factors that may cause disease, should carefully understand the mode of exposure, work and process flow, and the interrelationship with the disease. Occupational skin diseases should be protected by discovering the cause of the disease, improving the process flow and working conditions as much as possible. Workers should also be instructed to understand the knowledge of occupational skin diseases and do personal protection. 10.Prevention of skin tumor: Avoid sun exposure, excessive sunburn can induce skin tumor. Avoid the use of chemicals that may cause cancer, do not smoke, regular medical checkups or timely consultation for early detection and treatment of abnormal skin conditions. 11.Psychotherapy of skin diseases: Psychotherapy can be divided into reasoning therapy and behavioral therapy. The reasoning treatment is the use of psychoanalysis, such as talking, inspiring patients to suppress the “subconscious” in the psychological contradictions into something conscious, all thoughts, experiences and the onset of the disease are freely expressed, so as to achieve the purpose of treatment. Behavioral therapy includes relaxation therapy, systematic desensitization therapy, and biofeedback therapy. Clinically, some persistent skin diseases, such as psoriasis, acne, and chronic urticaria, have been improved to varying degrees through psychotherapy.