How to know where the stone is located, can be through the following methods. 1, urinary system ultrasound, ultrasound belongs to a kind of non-invasive examination, the price is low, and there is no radioactivity. ultrasound can understand the size of the stone, the location of the stone, and can determine whether the stone is crushed or whether the stone has been downwardly shifted. 2, urinary system X-ray. It can also measure the transverse diameter and long axis of the stone to determine whether the stone can be easily discharged. 2, X-ray examination of the urinary system. X-ray examination for high-density stones has the significance of judging, can be very intuitive to understand which part of the stone is located in, and through the body surface of the bony markers, to determine the downward displacement of the distance, but for some of the negative stones can not be judged, such as pure uric acid stones, the X-ray shows that the stone can not be detected where it is. The CT examination of the urinary system is expensive, but the positioning is relatively accurate, and it can find the small stones that can not be found by X-ray or ultrasound.CT examination can determine the degree of downward displacement of the stones, and CT can understand the situation of the stones and the adhesion of the surrounding ureters and kidneys, and whether there is a granuloma around the formation of the situation.