When it comes to nutritional diseases, many readers tend to think of malnutrition, protein deficiency, rickets, etc. Nowadays, with the growth of China’s economy, the improvement of people’s living standards, and the care of families and society for children, malnutrition diseases are rare in China, especially in economically developed areas. But the opposite is true, a new type of chronic nutritional disease – pediatric obesity disease, has become China’s children’s invisible killer, and has not attracted the attention of the general public. Pediatric obesity, if exclude heredity, disease and other factors, most is due to long-term large intake of food, at the same time too little activity, resulting in excessive accumulation of body fat, weight more than a certain range and caused by chronic nutritional diseases. Obesity can lead to increased incidence of asthma in pediatric period, which brings huge mental and economic burden to families. In the youth development period can affect the development of sexual organs, and even lead to infertility. Obesity disease also increases the risk of coronary heart disease, diabetes, hypertension and hyperlipidemia in adulthood. Therefore, it must attract sufficient attention of the society and family. We generally call the weight more than the normal value of 10% ~ 19% overweight, more than the normal human weight of 20% called obesity disease, if more than the normal human weight of 50% called severe obesity. Pediatric obesity is mainly due to the increase of fat, and the increase of fat includes the increase of the number of fat cells and the increase of the volume of fat cells. The increased number of fat will not disappear. Therefore, if pediatric obesity is caused by the increase in the number of fat cells, the treatment of obesity disease is more difficult. The main periods when the number of fat increases are: the first 3 months of life, the first year of life, and around 10 years of age. If in these three periods the intake of nutrition is excessive, it will cause stubborn obesity, of course the weight loss effect is poor. The principle of pediatric obesity disease treatment is to try to reduce the weight of children close to normal children, and at the same time does not affect the health and development of children. Obese children should provide low-fat, high-protein diet, in order to meet the appetite of children, to avoid hunger, should choose a large volume, low energy food, such as: mixed corn, millet, sweet potatoes, beans, asparagus, walnuts, peanuts, fungus, mushrooms, mushrooms, eggplant, kelp, etc.. Good eating habits have an important role in weight loss, obese children to eliminate the dinner too full, eating late, snacking, eating too fast and other habits. Eat less fried, fast food and other foods. At the same time should encourage children to participate in sports, can choose both effective and easy to adhere to the exercise such as doing exercises, rope skipping, etc.. The prevention of pediatric obesity disease should be paid attention to from the birth of the child. In the mother’s late pregnancy, to adhere to the “middle way”, not only to prevent malnutrition, but also to prevent the fetus overweight. The ideal weight of the child at birth is 6 pounds to 8 pounds, do not think that the heavier the baby is born, the better. Obesity in breastfed children is significantly lower than in cow’s milk fed children, so insist on breastfeeding. To promote the view that obesity is not healthy, so that parents give up the stereotypical view that the fatter the healthier.