Lemons are rich in vitamin C, which has positive benefits for the liver. Patients can also eat a moderate amount of oranges, oranges and grapefruit, which are high in vitamin C and have positive significance for the maintenance of the patient’s liver function and immune system. In addition, for patients with poor liver function, such as blood tests for hepatitis B three systems suggesting elevated glutathione and glutamic oxalacetic transaminase, there is a possibility of further elevation of bilirubin. For such cases patients should be further examined for the possibility of underlying liver disease, such as viral hepatitis and the presence of diseases such as autoimmune hepatitis, or cholestatic hepatitis. After the cause is identified, the patient needs to be actively treated with liver protection. If it is caused by viral hepatitis, check hepatitis B DNA or hepatitis C RNA indicates that the virus has replicated, and combined with liver function damage, then we should actively consider antiviral treatment.