Imaging should be done in all patients with clinical symptoms of urinary stones, and the results are of great value for further examination and treatment of stones. 1. Ultrasound (recommended) Ultrasound examination is easy, economical and non-invasive, and can detect X ray positive and negative stones above 2mm. In addition, ultrasound examination can also understand the degree of expansion of the urinary tract above the stone and indirectly understand the renal parenchyma and collecting system. In bladder stones, ultrasonography is able to observe both the bladder and prostate and look for causative factors and complications of stone formation. However, ultrasonography is less sensitive in diagnosing stones in the middle and lower ureter due to the influence of intestinal contents. Ultrasound can be used as a routine examination method for urinary stones, especially as the method of choice in case of renal colic. 2. Urethral plain film (KUB plain film) (recommended) Urethral plain film can detect about 90% of X-ray positive stones, and can roughly determine the location, morphology, size and number of stones, and initially suggest the chemical nature of stones. Therefore, it can be used as a routine method of stone examination. On urethral plain radiographs, stones of different composition are visualized in the following order: calcium oxalate, calcium and magnesium ammonium phosphate, cystine, and urate-containing stones. Simple uric acid stones and xanthine stones are able to pass X-rays (X-ray negative), cystine stones have a low density, and the latter are more faintly visualized on urethral plain films. 3.Intravenous urography (IVU) (recommended) IVU should be performed on the basis of urograms. Its value is to understand the anatomy of the urinary tract, to determine the location of stones in the urinary tract, to detect X-ray negative stones that cannot be shown on urograms, and to identify suspicious foci of calcification on plain films. In addition, the function of the divided kidney can be understood and the degree of hydronephrosis can be determined. In cases where the function of one side of the kidney is severely impaired or where the kidney is not visualized with a normal dose of contrast, the use of an increased dose of contrast (double or high dose) or a delayed film can often achieve renal visualization. During an attack of renal colic, the diagnosis of stones can be difficult because of acute urinary tract obstruction that often leads to non-development or poor development of the urinary tract. 4.CT scan (optional) The diagnosis of urinary stones usually does not require CT examination. However, because CT scans are not affected by stone composition, kidney function or respiratory motion, and because spiral CT is also capable of simultaneous two- and three-dimensional reconstruction of the acquired images, it can detect small stones that are easily missed in other conventional imaging examinations. CT is more sensitive than plain urography and intravenous urography in the diagnosis of stones, and is particularly suitable for the diagnosis of patients with acute renal colic, and can be an important supplement to X-ray examinations. In addition, the composition and fragility of stones can be initially evaluated by different changes in CT values, which can provide a reference for the choice of treatment. Enhanced CT can show the degree of hydronephrosis and the thickness of renal parenchyma, thus reflecting the altered renal function. Retrograde or percutaneous nephrostomy (optional) is an invasive test and is not used as a routine test. It is only used when intravenous urography is unremarkable or poorly visualized and when X-ray negative stones are suspected and further differential diagnosis is needed. 6.Magnetic resonance water imaging (MRU) (optional) magnetic resonance is extremely poor for the diagnosis of urinary tract stones, so it is generally not used for the examination of stones. However, magnetic resonance water imaging (MRU) can understand the situation of upper urinary tract obstruction, and does not require contrast to obtain the same effect as intravenous urography, and is not affected by changes in renal function. Therefore, it can be considered for patients who are not suitable for intravenous urography (such as contrast allergy, severe renal impairment, children and pregnant women, etc.). 7, Radionuclide (optional) Radionuclide examination cannot directly show urinary stones, however, it can show the morphology of the urinary system, provide renal blood perfusion,. information on renal function and urinary tract obstruction, and is therefore valuable for the selection of surgical options and the evaluation of surgical efficacy. In addition, renal dynamic imaging can be used to assess the impact of extracorporeal shock wave lithotripsy on renal function.