Liver cancer is a malignant tumor of the liver, which can be divided into two categories: primary and secondary. It is the third most common malignant tumor after gastric cancer and esophageal cancer in terms of mortality rate. The initial symptoms are not obvious, and the late symptoms mainly include liver pain, weakness, wasting, jaundice, ascites and other symptoms. The following are the routine diagnostic measures of liver cancer. Clinical diagnosis 1. B-type ultrasound imaging can show tumors with diameter of 2cm or more, which is of great value for early localization examination; electronic computerized X-ray tomography (CT) can show tumors with diameter of 1.0cm or more; radionuclide scan can show tumors with diameter of 3-5cm or more; other X-ray hepatic angiography and nuclear magnetic resonance imaging have certain value for diagnosis of liver cancer. (2) Imaging examination with clear intrahepatic substantial occupying lesions can exclude hepatic hemangioma and metastatic liver cancer and have one of the following conditions: (1) typical imaging manifestation of primary liver cancer; (2) AFP>20mg/ml; (3) clear distant metastatic lesions or bloody ascites or cancer cells found in ascites; (4) clear hepatitis B marker positive cirrhosis; (5) no jaundice and markedly increased AKP or r-GT. (3) If there is no other evidence of hepatocellular carcinoma, positive AFP convective method or AFP>400mg/ml for more than four weeks by radioimmunoassay, and can exclude active liver disease of pregnancy germinal gland embryonic-derived tumor and metastatic hepatocellular carcinoma. Pathological diagnosis 1. Histological examination of extrahepatic tissues confirms hepatocellular carcinoma. 2.Hepatic histological examination confirms primary hepatocellular carcinoma.