The full name of ultrasound examination is B-type ultrasound examination. Ultrasound is a kind of sound wave, the sound wave from the probe through the coupling agent into the body, when it encounters the body without gas organs, such as the liver, kidneys or the fetus in the pregnant woman’s belly, it will be reflected back, these reflected back sound waves through the computer calculation into a picture, in the screen appears the image of the organ or fetus. Ultrasound is simple to perform, quick to diagnose, and non-invasive, and can be ranked as the routine preferred examination method, sometimes even eliminating the need for further X-ray examinations. It is suitable for diagnosing diseases in the adrenal glands, kidneys, bladder, prostate, and scrotum. Ultrasound can explore the size, contour, location and internal structure of the kidney. Ultrasound scan can detect kidney cancer of about 2 cm and small cysts that cannot be shown by X-ray plain film or intravenous urography. Ultrasound is useful for the diagnosis of hydronephrosis and kidney stones, the localization of renal prolapse and ectopic kidney, as well as guiding the localization of renal puncture. ultrasound is useful for understanding the residual bladder urine volume, tumor size, location, depth of infiltration, prostate size, internal reflection, as well as diagnosing prostate hyperplasia and prostate cancer. intracavitary ultrasound scan is more clear and accurate for showing the extent and depth of bladder tumor infiltration and the internal blood flow of the tumor. The intracavitary ultrasound scan is more clear and accurate in showing the extent and depth of bladder tumor infiltration and blood flow inside the tumor. In addition, ultrasound scans are also useful in identifying solid or cystic masses in the scrotum. Ultrasound examination of the urinary system often includes the bilateral kidneys, adrenal glands, ureters, bladder and prostate. The kidney is one of the good organs for ultrasound detection because of its large enough size, characteristic morphology, good sound transmission properties and clear borders. Because it is a pair of retroperitoneal organs, intra-abdominal stray images such as pneumoperitoneum of the intestine have little effect on it, therefore, it is not necessary for the patient to fast and take internal bowel cleanser before renal ultrasound examination. The normal adult renal pelvis has a capacity of about 3 to 10 ml, and the bladder is a urinary storage organ that contains a large amount of urine when it is full, which can provide a good interface for ultrasound reflection, therefore, patients should drink 30 0 to 500 ml of water before checking the bladder and prostate, and it is best not to urinate for 2 to 3 hours, so that the bladder is full and urine becomes a natural contrast agent so that ultrasound can clearly distinguish abnormal echogenic shadows in the bladder . For patients who need to measure residual urine, return to the ultrasound clinic immediately after urination to measure residual urine. In addition, a variety of positions can be used depending on the purpose of detection and the patient’s condition, generally the most common being prone, with both hands on the head, as relaxed as possible, the chest close to the examination bed, and the lumbar muscles relaxed. When it is necessary to detect in the standing position, the patient should turn his back to the examining physician and place his hands crossed in front of his chest in an upright position, without tilting. Before the probe, the doctor must be applied to the probe site like a cleanser coupling agent to make close contact between the probe and the skin, so that the ultrasound smoothly into the body organs, this coupling agent is safe, non-toxic, non-irritating to the skin, after the examination, as long as the soft paper can be gently wiped away.