Fatty liver disease is divided into non-alcoholic fatty liver disease and alcoholic fatty liver disease, and the diagnosis of non-alcoholic fatty liver disease is as follows: 1. No history of alcohol consumption or alcohol consumption equivalent to alcohol, <140g/week for men and <70g/week for women. 2. Ultrasound or CT and other imaging examinations meet the changes of fatty liver or liver puncture liver histological examination meet the criteria of fatty liver disease, and exclude viral hepatitis, drug-related hepatitis and autoimmune liver disease, hepatomegaly, hypothyroidism and other diseases that can lead to fatty liver, can be diagnosed as non-alcoholic fatty liver disease. The diagnosis of alcoholic fatty liver disease is as follows: 1. a history of excessive alcohol consumption lasting more than 5 years, with an average daily intake of >40g of alcohol for men and 20g for women, or a large daily intake of alcohol for two consecutive weeks, with an intake of >80g of alcohol per day. 2. laboratory tests, with a ratio of glutamic oxalyl aminotransferase to glutamic alanine aminotransferase >1.5, and elevated glutamyl transpeptidase and mean red blood cell volume. 3. imaging such as ultrasound or CT The examination is consistent with the changes of fatty liver, and other causes are excluded, and alcoholic liver disease can be diagnosed.