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 travel normally and measure whether the lumen internal diameter is normal. In common fatty liver, the liver parenchyma will be echogenically enhanced and diffuse, and sometimes the volume of the liver will increase. Hepatic cysts manifest as echogenic areas in the liver, which may be single or multiple, with a regular pattern of echogenic areas and clear borders. The ultrasound manifestation of hepatic hemangioma is a hyperechoic or hypoechoic nodule in the liver with uniform internal echogenicity and a sieve-like pattern, with clear nodule borders and a relatively regular pattern. In cirrhosis, the liver will be smaller in size and the liver parenchyma will be thicker in echogenicity. In case of secondary liver cancer, single or multiple solid nodules will be found in the liver. Such nodules have uneven internal echogenicity, and the boundaries may be clear and the morphology may be regular, which should be observed in conjunction with the medical history and focused on. 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.