The diagnosis of liver metastasis of lung cancer is mainly based on pathological biopsy, and other diagnostic bases include previous history of lung cancer, ultrasound and CT of liver, laboratory tests, etc. 1. Pathological biopsy: Pathological biopsy is an important examination tool for confirming lung cancer, and it can also be used to diagnose liver metastases of lung cancer, which needs to be performed under the guidance of imaging. 2. History of lung cancer: Lung cancer has been diagnosed in the past, and other clinical manifestations such as hepatomegaly, abdominal distension, jaundice, ascites, etc. have recently appeared. 3. Liver ultrasound and CT: they can be used to assist in the diagnosis of lung cancer metastases in the liver and other parts of the body. 4. Laboratory examination: for example, blood biochemistry, on the premise of excluding other liver diseases, when blood biochemistry indicates that the indexes of ghrelin and bilirubin are elevated, it is considered that liver metastasis of lung cancer may have occurred. The occurrence of liver metastasis of lung cancer indicates that the condition is more serious, and it is suggested that patients should consult the doctor in time and standardize the treatment.