Non-alcoholic fatty liver disease (NAFLD) is a clinicopathological syndrome characterized by hepatocellular steatosis and lipid accumulation without a history of excessive alcohol consumption, and includes four pathological processes: simple fatty liver, steatohepatitis, fatty liver fibrosis and fatty liver cirrhosis. In recent 2O years, the incidence of NAFLD has been on the rise in developed and relatively backward regions, and in men and women worldwide, while the prevalence of NAFLD in adults in developed regions of China is l5%, which has become the second most common liver disease after chronic viral hepatitis. Clinical epidemiological studies on the risk factors of NAFLD show that obesity, hyperlipidemia, hyperglycemia and hypercholesterolemia are closely related to the occurrence of fatty liver. Studies by domestic and foreign scholars have concluded that insulin resistance in obese people and diabetic patients causes disorders of lipid metabolism, which increases lipid synthesis and decreases efflux and deposits in the liver, and fatty liver occurs. Fatty liver is a reversible disease, and timely comprehensive treatment measures such as eliminating the causes, correcting bad habits, paying attention to self-care, adjusting diet, reasonable exercise and medication are the key to preventing and treating fatty liver. Some studies have shown that: advanced age, men, bureaucrats, alcohol drinkers, obese people, people with high blood sugar, high uric acid, high triglycerides, high cholesterol, and high ALT are all high-risk groups for fatty liver. Therefore, it is suggested that the focus of fatty liver population prevention and treatment should be prioritized on men, bureau level, advanced age, alcohol drinkers, obese, and people with metabolic dysfunction. Second, the clinical manifestations of NAFLD vary with the etiology and the degree of liver fat and inflammatory infiltration. Most patients have no obvious symptoms, only found during physical examination, a few patients will have fatigue, right upper abdominal fullness or vague pain; hepatomegaly is the only sign of many NAFLD patients, such as NAFLD patients found to have chronic liver disease or thrombocytopenia suggests the presence of severe liver disease cirrhosis, its complications are mostly ascites, esophageal variceal bleeding. Clinical Diagnostic Criteria In 2006, the Fatty Liver and Alcoholic Fatty Liver Disease Group of the Chinese Medical Association Hepatology Branch issued the diagnostic criteria for NAFLD in China, and anyone who has any of the following items 1 to 5 and 6 or 7 can be diagnosed with NAFLD.