Alpha-fetoprotein (AFP) test AFP is one of the most specific methods for diagnosing hepatocellular carcinoma, with relative specificity, and has a definite role in diagnosis, judging the efficacy, estimating prognosis and preventing recurrence. Blood enzymatic examination Mainly refers to γ-glutamyl transpeptidase, alkaline phosphatase and lactate dehydrogenase isoenzymes, the measured values can be significantly higher than the normal range, but because of their lack of specificity, they are mostly used as auxiliary diagnostic tests for hepatocellular carcinoma. Angiography still plays a certain position in the diagnosis of liver cancer, and it can diagnose small hepatocellular carcinoma less than 2 cm more accurately and quickly, but it is not widely used in clinical practice because of its invasive nature. CT examination is currently the most important imaging liver cancer examination method for diagnosis and differential diagnosis of liver cancer. It is used to observe the morphology and blood supply condition of liver cancer, detection, characterization and staging of liver cancer as well as review of liver cancer after treatment. In contrast, plain scan has limited value and can be used to observe steatosis, bleeding and deposition after iodine oil embolization. Enhancement scan should be considered as routine, and direct enhancement scan is feasible, with additional flat scan as needed. B-type ultrasonography B ultrasonography not only can clearly show the size and morphology of tumor, and find lesions of 2 cm or even smaller in diameter, but also has the characteristics of easy operation and low cost, so it is a better non-invasive examination method with localization value at present. MRI examination MRI examination is a powerful supplement to the imaging diagnosis of liver cancer and is becoming more and more important with the development of magnetic resonance technology. MRI has advantages in detecting and characterizing liver cancer in the context of fatty liver and cirrhosis, and judging tumor residue and recurrence after liver cancer intervention. PET-CT This examination is the most advanced imaging equipment at present, which can be used to confirm the diagnosis of primary foci and also detect systemic metastases, especially in determining metastases, which is far more advantageous than CT and other examinations.