Ultrasound is more accurate, and it is economical, affordable and fast. The first choice for liver examination is ultrasound, which is also one of the current liver checkups. ultrasound can not only clarify whether there are any abnormalities in the size, shape, texture and echoes of the liver, but also further observe whether there is dilatation of the portal vein, hepatic vein and bile ducts, and whether there are any abnormal echoes in them. In addition, ultrasound can also observe whether there are space-occupying lesions in the liver and whether there is liver fibrosis. In the case of space-occupying liver lesions, ultrasound can also be used to determine whether the lesion is benign or malignant. In addition, many liver diseases can be clinically treated under ultrasound localization, such as puncture and drainage of liver cysts and liver abscesses, radiofrequency ablation and microwave ablation of liver cancer. However, ultrasound also has certain limitations, for ultrasound can not be clearly diagnosed, may also be further CT or MRI, and even can be performed under the ultrasound localization of liver puncture biopsy.