Eating disorders are a group of psychiatric disorders related to psychosocial factors, mainly abnormal eating behavior, accompanied by significant physical and psychosocial dysfunction, and not secondary to physical or mental illness. Eating disorders in children and adolescents mainly include infantile feeding disorder, anorexia nervosa, bulimia nervosa and xerophagia, among which anorexia nervosa and bulimia nervosa are more common. Young women are the typical group with eating disorders. Anorexia nervosa is a disorder of the patient’s own making and maintenance, characterized by intentional weight loss. The central psychological feature of anorexia nervosa is the characteristic over-valued perceptions about body size and weight. Patients believe they are too fat even though they are underweight and often resort to excessive exercise, induced vomiting, and induced diarrhea to lose weight. The treatment starts with the correction of malnutrition, while psychological and pharmacological treatment is carried out at the same time or later, and research proves that the combination of multiple modalities is the best way to treat this disease. The treatment of anorexia nervosa is generally divided into two phases: the first phase aims to restore weight and save lives; the second phase aims to improve psychological function and prevent relapse. Bulimia nervosa is an eating disorder characterized by recurrent and irresistible desire to eat and binge eating behavior, and after eating, various methods are used to lose weight for fear of gaining weight, making weight change not always obvious. The patient is aware that this eating pattern is abnormal, but cannot control it. The disease may alternate with anorexia nervosa. The basic principle of treatment is to improve cognition, relieve symptoms, and prevent relapse, so psychotherapy is the mainstay of the disease, supplemented by medication, and active somatic treatment for those with obvious malnutrition or somatic complications.