In recent years, the city’s children and adolescents obesity is a significant upward trend. At present, the obesity rate of children and adolescents aged 2-18 in our city is close to 10%, and 11% of children of the same age are overweight, which is very likely to develop into obesity. Obesity in children and adolescents often leads to an increased incidence of fatty liver, hypertension, hyperlipidemia and type 2 diabetes. Studies have found that the proportion of obese children suffering from hypertension, high triglyceride and type 2 diabetes is 32.5%, 23.3% and 0.65‰ respectively, which is several times or even more than ten times of normal weight children. Under normal circumstances, fat only accounts for 3-5% of the liver tissue, and if it exceeds 5% it is a fatty liver. Recently, the Capital Institute of Pediatrics conducted fatty liver and liver function tests on a group of obese elementary and middle school students and found that 10% of the obese children met the diagnostic criteria for clinical fatty liver, a rate 51 times higher than that of normal weight children. A distinctive physical feature of children and adolescents with fatty liver is a “big belly”, i.e., fat gathered in the waist and abdomen. These obese children with large bellies are much more likely to develop fatty liver than children who are obese in general. After viral hepatitis, fatty liver has become a major liver disease that threatens the health of children and adolescents, and it needs the attention of the whole society. The liver is the second largest organ in the human body besides the heart, and is known as the chemical factory of the human body, undertaking the functions of digestion, metabolism and detoxification. Once children suffer from fatty liver, liver function will be affected, which not only affects normal growth and development in childhood, but also causes fat metabolism disorder and can lead to diabetes and other diseases. As children grow older and the course of fatty liver disease increases, fatty liver in children can gradually develop into steatohepatitis, liver fibrosis and even cirrhosis, which is almost as harmful as viral hepatitis B. Most fatty liver is associated with obesity and hyperlipidemia. The history of fatty liver in children and adolescents is relatively short, and most of them can be controlled and cured through timely intervention. Controlling obesity is the key to preventing and treating fatty liver in children and adolescents.