Many families think that “little fat pier” is a sign of civilization and health, which is a misunderstanding of childhood obesity. In fact, it is a chronic disease closely related to lifestyle, characterized by excessive nutrition, insufficient exercise and abnormal behavior, and the general excessive accumulation of fat in the whole body as the performance. Bring a lot of near-term and long-term harm to children’s health, about 10-30% of children with obesity have high blood pressure, blood lipids, transaminases, children obesity and many diseases in adulthood are closely related, such as hypertension, hyperlipidemia, diabetes, cardiovascular and cerebrovascular sclerosis. In serious cases, the aerobic capacity decreases, the anaerobic domain shifts left, the cardiorespiratory reserve capacity decreases, and even damages the cardiorespiratory function. Studies have found that obese children have a variety of psychological and behavioral problems. Such as: sense of self-image, poor self-confidence, easy to inferiority, depression, rejection, the most prominent is the eating behavior, exercise behavior, potential development is hindered problems. Simple obesity in children is a chronic disease with potential harm, which should attract parents’ high attention and early comprehensive treatment, and the treatment measures include several aspects. First, under the guidance of doctors, gradually correct unhealthy lifestyles, especially correct excessive eating habits. Gradually change snacking, unnecessary extra meals and gulping eating habits. Secondly, individualized exercise prescriptions should be formulated according to the child’s specific situation, and sports such as running, skating, swimming, cycling and ball games should be reasonably arranged with an exercise intensity of 50% of the individual’s maximum oxygen consumption (heart rate of about 135 beats/min), and about one hour of exercise per day, with special attention to prevent sports injuries at the beginning and persistent exercise to ensure the efficacy and prevent rebound. Third, on the basis of behavioral analysis, the doctor will develop and parents will cooperate in implementing a program to correct behavioral abnormalities. It can be implemented according to the way of mediated behavior → target behavior → deadline reward and punishment. The near-term goal for the treatment of childhood obesity is to reduce the amount of fat, increase lean body mass and enhance physical fitness. The long-term goals are to establish a scientific lifestyle, give full play to potential, character building, temperament development, and eliminate cardiovascular and cerebrovascular disease risk factors. The treatment of obesity in children should not be like adults who are obsessed with the so-called “weight loss effect”, the treatment measures for children must not affect the normal growth and development of children as a premise. Therefore, starvation, semi-starvation or disguised starvation therapy is strictly prohibited; short-term rapid weight loss (heavy); drug weight loss (heavy); surgery weight loss is strictly prohibited.