Chronic hepatitis B and fatty liver are the two main diseases in hepatology at present, and the related knowledge is many and varied, summarized as follows. Chronic hepatitis B has three main characteristics: progression: it can turn into cirrhosis, liver cancer; occurrence of liver failure, gastrointestinal bleeding, liver coma, ascites, infection, liver and kidney syndrome and other diseases. Curable: The liver-protective drugs, which were the mainstay in the past, and the antiviral therapy, which is the mainstay now, can play a role in protecting the liver. Difficult to cure: The existing antiviral drugs are difficult to remove the hepatitis B virus completely, and have disadvantages such as drug resistance and relapse. There are two types of fatty liver: eating too much, the body fat increase “overflow” to the liver, become fatty liver, and diabetes, cardiovascular and cerebrovascular disease, called the “metabolic syndrome”, through the adjustment of diet, reasonable exercise, most can recover. This situation is called “liver fat people fat, the problem is not big”. Drinking too much, alcohol damage to the liver, fat accumulation in the liver and lack of subcutaneous, and alcoholic hepatitis and other components of the “alcoholic liver disease”, you must stop drinking, and give liver drugs. This situation is called “liver fat people thin, the problem is not small”.