Ultrasound and blood tests are both auxiliary tests for diagnosing liver diseases, and it is impossible to distinguish which one is more accurate. 1. As a preliminary screening tool for liver diseases, ultrasound is useful in the initial diagnosis of liver stones, liver hemangiomas, liver cysts, liver abscesses, liver adenomas and liver cancers, which are more common in clinical practice. In addition to occupational lesions of the liver, it is also relatively sensitive to changes in liver density caused by fatty liver and hepatitis. 2. Blood tests mainly include aminotransferase, bilirubin, albumin, liver fiber four items, coagulation function, alpha-fetoprotein, hepatitis B five items and hepatitis B virus DNA quantification. They can reflect whether there is damage to liver cells, assess the synthesis and transformation function of liver cells and the condition of bile excretion, and can also be used to measure the inflammatory activity of the liver and the degree of fibrosis. Both ultrasound and blood tests are necessary for liver diseases, and the combination of both is necessary for a better diagnosis of the disease.