Infectious liver disease is mainly divided into five types, can cause infectious hepatitis is mainly caused by hepatophilic virus infection, hepatophilic viruses including viral hepatitis A, viral hepatitis B, viral hepatitis C, viral hepatitis D and viral hepatitis E, the main common is these five kinds. Among them, hepatitis A and E are mainly transmitted through the digestive tract, causing infections that are acute and basically rarely chronic. Hepatitis B, C and D are mainly blood-borne diseases and can be chronic, which can cause cirrhosis and liver cancer. Hepatitis B is the most common and the most dangerous, but hepatitis B can be prevented by vaccine. There is no vaccine for hepatitis C, but at present, chronic hepatitis C can be cured by antiviral treatment. Hepatitis D can only be contracted on the basis of hepatitis B. Therefore, diagnosis and treatment of hepatitis B can prevent and treat hepatitis D.