Abdominal ultrasound can check the size, location, morphology of abdominal organs and the presence of abnormal lesions, etc. There are more abdominal organs that can be examined, and the application range is wide. The organs in the abdominal cavity can all be examined. If distinguished by location, the upper abdomen has the liver, gallbladder, spleen, pancreas, etc.; the lower abdomen is mainly the urinary and reproductive system, with the kidneys, bladder, prostate, uterus, ovaries and testes. While the gastrointestinal tract is affected by gas, ultrasound examination will be somewhat restricted, but intestinal peristalsis can be observed, and ultrasound examination can also be performed after the stomach cavity is filled with liquid (drinking 1000-2000 ml of water). 2.Checking disease types (1) abdominal vascular lesions: including abdominal aorta, inferior vena cava, renal artery, renal vein, portal vein, etc., check for aneurysm, arterial stenosis, venous thrombosis, portal vein spongiosis, etc.; (2) abdominal occupying lesions: such as cysts, polyps, stones, tumors, inflammation, etc.; (3) abdominal fluid and ascites; (4) abdominal wall soft tissue tumors, etc. (3) Ultrasound-guided interventional treatment Abdominal diseases, especially tumors, abdominal fluid and ascites, can be treated with ultrasound-guided puncture biopsy, drainage, radiofrequency or microwave, etc. Ultrasound examination of the abdomen is a relatively common examination modality at present, which has the advantages of being simple, convenient, non-invasive, radiation-free and less expensive. However, the diagnosis of substantial organ diseases is not yet as valuable as CT and MRI, especially for retroperitoneal diseases, which are easily disturbed by intestinal gas and affect the accuracy of diagnosis. Therefore, abdominal examinations need to adopt appropriate examination methods according to the characteristics of the site and disease to improve the accuracy of disease diagnosis.