Diagnostic imaging should be done for all patients with clinical symptoms of urinary stones, and the results are of great value for further examination and treatment of stones. 1.B ultrasound (recommended) Ultrasound examination is easy, economical and non-invasive, and it can detect both positive and negative X ray 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 films, 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 through X-rays (X-ray negative), cystine stones have low density, and the latter are more faintly visualized on urethral plain films. 3.Intravenous urography (IVU) (recommended) Intravenous urography 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 calcified foci 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 contrast dose (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 visualization of the urinary tract. 4.CT scan (optional) CT examination is usually not required for the diagnosis of urinary stones. However, because CT scan is not affected by stone composition, renal function and respiratory motion, and because spiral CT can simultaneously reconstruct the acquired images in two and three dimensions, it can detect small stones that are easily missed in other conventional imaging examinations. It is an important complement to X-ray. In addition, the composition and fragility of stones can be initially assessed by different CT value changes, which can provide a reference for the choice of treatment. Enhanced CT can show the degree of hydronephrosis and the thickness of the renal parenchyma, thus reflecting the altered renal function. 5.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 has very poor diagnostic effect on 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.