As people’s living standards continue to improve, dietary structure and child-rearing practices change, more and more fat children are becoming obese, and obesity has become an important factor threatening children’s health. Obesity can lead to circulatory, respiratory, digestive, endocrine, immune and other multi-system damage, affecting children’s IQ, behavior, psychological and sexual development. Obesity on children’s physical and mental health of the most important eight hazards are described as follows: 1, obese children high blood lipids obese children significantly higher than normal children, and dyslipidemia is atherosclerosis, hypertension, coronary heart disease, high-risk factors. 2, obese children are prone to respiratory diseases obese children chest wall fat accumulation, compression thoracic expansion is limited, compliance is reduced, septal movement is limited, affecting lung ventilation function, so that the respiratory resistance is reduced, prone to respiratory diseases. Such as obstructive sleep apnea, obesity hypoventilation syndrome, asthma, etc. 3, obese children are prone to fatty liver The prevalence of fatty liver in severely obese children is as high as 80%, childhood obesity is an important risk factor for fatty liver, hypertension, hyperlipidemia is the danger signal of fatty liver in obese children. 4, obese children are vulnerable to digestive system diseases The prevalence of digestive system diseases in obese children is 15%, significantly higher than normal children 4%. 5, obese children’s immune function is low obese children’s immune function is low, especially the cell activity is significantly reduced, and therefore vulnerable to infectious diseases. 6, obese children have hyperinsulinemia obese children commonly have hyperinsulinemia, in order to maintain the needs of glucose metabolism, long-term forced to secrete a large amount of insulin, resulting in the failure of pancreatic secretion function, causing diabetes. 7, obese children precocious sexual maturity obese children male blood testosterone content and female serum dehydroepiandrosterone sulfate content is significantly higher than normal children, increased body fat can cause increased secretion of adrenal hormones, so that the hypothalamus to the circulation of sex hormone threshold sensitivity is reduced, precocious sexual maturity. Sexual development in advance can cause sexual awareness, will produce early confusion about sex, fear, anxiety and other adverse psychological states, affecting children’s learning and life. 8, obese children with low IQ The total IQ and operation quotient of obese children is lower than that of healthy children, and their activities, learning and sociability are low, which will lead to depression and low self-esteem over time, making children sensitive to interpersonal relationships, introversion, low social adaptability and affecting children’s mental health.