Obesity in children is now increasingly common and is mainly caused by an increase in the number or size of fat cells in the body, including diet, exercise, environment, genetics and other multifactorial influences. The increase of fat cells usually occurs in the first 3 months of life, between the first year of life and between 11-13 years old, and is likely to lead to obesity. And it is relatively difficult to treat obesity, and it is easy to relapse after cure. First, physical harm. Excessive obesity will increase the probability of children suffering from diabetes, fatty liver, high blood pressure, high blood pressure, and also increase the burden of children’s heart and respiratory system, seriously affecting the health of children. Excessive obesity in boys will cause genital hypoplasia, breast development, delayed sexual maturity. Girls obesity, will cause the child precocious puberty, vulvodynia, menstrual disorders, etc.. Second, the mental impact. Especially school-age children, excessive obesity will lead to children’s low self-esteem, which affects the child’s learning and communication. Therefore, children’s obesity is still very harmful to children. It is recommended to go to the children’s endocrinology specialist to conduct professional assessment and intervene in children’s obesity through medical weight reduction, which can ensure the needs of children’s growth and development and also control the obesity rate of children.