Fatty liver is not an independent disease; it is a metabolic disease caused by multiple factors or diseases that result in excessive accumulation of fat in the liver cells, gradually transitioning to liver fibrosis. Fatty liver is usually asymptomatic and most of it is detected during ultrasound examination. The main hazards of fatty liver are: damage to liver, promoting atherosclerosis formation, inducing or aggravating hypertension, coronary heart disease, leading to cirrhosis, liver failure, liver cancer, inducing or aggravating diabetes, reducing human immune function, etc. In the treatment of fatty liver, the most important thing is to treat the primary disease and remove the causes, especially the easily neglected causes, such as drug-related liver damage, alcoholic liver injury, hyper- or hypothyroidism, severe anemia and chronic hypoxic state caused by cardiac insufficiency. Diet therapy is the most basic treatment for patients with fatty liver. The diet requires high protein, moderate amount of calories, low sugar, moderate amount of fat, adequate vitamins, and supplementation with dietary fiber and minerals. Abstain from alcohol and remove bad eating habits. Maintain ideal body weight as much as possible and maintain normal blood sugar and blood lipids. At the same time, perform reasonable exercise, of which walking is the easiest and simplest to do, and maintain it for more than half an hour daily. If liver function is obviously abnormal, take appropriate liver protection drugs. Patients with fatty liver should choose lipid-lowering drugs carefully. Alcoholic fatty liver is often accompanied by hyperlipidemia. Unless there is also coronary heart disease, only for those who continue to have abnormal lipids even after 3 months of diet control, exercise and treatment of the primary disease, appropriate lipid-lowering drugs with less impact on liver function should be given. Fatty liver caused by primary hyperlipidemia can be treated with lipid-lowering drugs on the basis of comprehensive treatment, but the dosage should be appropriately reduced and liver function should be tested, and liver-protective drugs should be combined if necessary, or lipid-lowering treatment should be started after liver function is corrected. Most of the fatty liver has good prognosis, and there is no obvious relationship between fatty liver and liver cancer. If fatty liver is detected and treated early, the further development of fatty liver can be stopped or even completely reversed.