Clinical measurement of the left lobe of the liver in transabdominal aortic long-axis section, the normal anterior-posterior diameter is less than 6 cm, and the upper and lower diameters are less than 9 cm. The liver is an important organ of the body, participating in sugar, protein, fat and vitamin metabolism. At the same time, the liver has the functions of synthesis, biotransformation, secretion and excretion, and has a strong regenerative capacity of liver cells. Clinically, it is found that the normal liver is wedge-shaped, and the left lobe is thin and small. Measuring the left lobe of the liver of a normal person through the abdominal aorta long-axis section, the anterior and posterior diameters can be seen to be less than 6cm, and the upper and lower diameters are less than 9cm. If intrahepatic cystic lesions, hepatic hemangioma, or hepatocellular carcinoma appear in the left lobe of the liver, the size of the liver will increase. Some patients are also prone to accompanying symptoms such as pain in the liver area, jaundice, abdominal distension, body fatigue, liver palms, spider nevus, or even black stools, vomiting blood, etc., which will have a serious impact on the quality of life and health. If abnormal liver size is found during examination and accompanied by uncomfortable symptoms, further detailed examination should be carried out in order to clarify the disease and then follow the doctor’s instructions for treatment to prevent aggravation of the condition.