Liver ultrasound can detect common diseases of the liver, such as fatty liver, cirrhosis, liver cysts, hepatic hemangioma, and malignant tumors of the liver. When doing liver ultrasound, it is important to observe the morphology of the liver, measure the size of the liver, observe whether the envelope is smooth and whether the liver parenchyma is evenly echogenic. Observe whether the blood vessels and bile ducts in the liver are traveling normally and measure whether the lumen internal diameter is normal.1. Commonly, in fatty liver, the liver parenchyma will be echogenically enhanced and diffuse, and sometimes the volume of the liver will increase.2. The manifestation of liver cysts is the presence of echogenic areas in the liver, which can be single or multiple, with regular shape and clear borders.3. The ultrasound manifestation of hepatic hemangioma is the presence of hyperechoic or hypoechoic nodules in the liver. The internal echogenicity of the nodules is uniform and sieve-like, and the nodules have clear borders and regular morphology. 4. The ultrasound manifestation of cirrhosis is that the volume of the liver will become smaller and the echogenicity of the liver parenchyma will be thickened. In case of secondary liver cancer, single or multiple solid nodules will be found in the liver. The internal echogenicity of such nodules is not uniform, and the boundary may be clear and the morphology may be regular, which should be combined with the medical history and focused on observation at this time. Here, patients should be reminded to try to fast for 6-8 hours when examining the liver so that the liver can be shown more clearly.