With China’s economic development and living standards improve, obese children increase year by year, there are literature reports, China’s coastal areas more than 10% of primary and secondary school students obese. Many parents think that children obesity is a healthy performance, but the fact is not so, children overweight or obesity can lead to hypertension, coronary heart disease, diabetes and many other diseases, in recent years the incidence of diabetes in children that is closely related to obese children, the prevention and treatment of childhood obesity has been the attention of developed countries around the world. Excessive accumulation of fatty tissue, so that the weight of children more than 20% of the standard weight of height or body mass index (weight and height of the square of the ratio) > 19kg/m2, is obese. The formation of obesity is related to heredity and bad living habits, eating too much, especially high-fat, high-sugar diet and too little exercise is the cause of obesity, there are obese people in the family, children are especially prone to obesity. Obese children are prone to insulin resistance, resulting in decreased insulin sensitivity and increased blood glucose, causing diabetes. The insulin dysfunction of diabetes can also cause abnormal lipid metabolism, further aggravating the dyslipidemia of obese children. Continuous high blood sugar and lipid abnormalities can cause cardiovascular diseases, such as atherosclerosis, coronary heart disease, etc., and cardiovascular lesions can cause hypertension, visual impairment, kidney disease, stroke and other diseases. Some studies have shown that up to 25% of obese children are accompanied by type 2 diabetes. Obese children with diabetes often do not have typical diabetic symptoms such as excessive drinking, polyuria and wasting in the early stage, but once typical diabetic symptoms appear, the cardiovascular lesions caused by continuous hyperglycemia and dyslipidemia are irreversible. Therefore, it is very important to prevent and control the occurrence of obesity and diabetes in children. The key to the prevention and treatment of childhood obesity is to change the bad habits of life, reasonable diet and strengthen exercise. Obese children should not be treated with weight-loss drugs. Diet should eat more vegetables, fruits, crude fiber food, appropriate protein food, such as lean pork, eggs, fish, poultry, etc., less greasy food, such as fried food, do not eat too much starchy food, such as cereals, flour, potatoes, etc.. Should adhere to the daily exercise, at least 30 minutes of exercise every day, such as rope skipping, running, playing ball, etc., should not sit in front of the TV for a long time to study TV programs or sit in front of the computer to forget to play games or Internet. Obese children should have regular medical checkups, such as regular testing of urine sugar, blood sugar, blood lipids and, if necessary, glucose tolerance tests, for early detection and treatment of diabetes, hyperlipidemia and other complications.