Ultrasound is currently the preferred method of diagnosing fatty liver; ultrasound is qualitative. It can also be used in conjunction with a fatty liver (liver fibrosis) detector and a CT scan of the abdomen to make a definitive diagnosis. Ultrasound can clearly visualize the location, size and shape of the liver as well as the internal echogenicity of the liver. The internal duct structure of the liver can also be seen, and it is possible to observe whether the blood vessels and bile ducts in the liver are normal, and whether there is any abnormal dilatation, stenosis or occlusion. Fatty liver is characterized by diffuse enhancement of near-field echoes in the liver region and gradual attenuation of far-field echoes on ultrasound images. B-mode ultrasound is economical, rapid, accurate, non-invasive, and has a diagnostic rate of 95% for severe fatty liver disease, but it is difficult to detect fatty liver once the degree of hepatic steatosis is less than 30%. ultrasound can detect fatty liver disease with a hepatic steatosis content of 30% or more, and the diagnostic sensitivity of ultrasound can be as high as 90% in cases with a hepatic steatosis content of 50% or more. Ultrasound, CT or MRI cannot accurately assess the staging of fatty liver, and serologic indicators should be referred to in order to accurately assess the staging.