In clinical practice, CT is generally more accurate than color ultrasound in detecting urinary stones. Urological stones are common and frequent diseases in urology, generally including kidney stones, ureteral stones, bladder stones and urethral stones. The diagnosis of urinary stones relies mainly on imaging in addition to the patient’s symptoms, signs, and routine urinalysis. At the same time, the diagnosis of imaging can be used to determine by what method of treatment. The first choice is color ultrasound, which has the advantages of convenience, no damage and cheap price. However, it may be affected by the patient’s gastrointestinal distension or stones are relatively small, so the observation is not very clear. CT examination, on the other hand, is less disturbed by gas and can detect stones smaller than 0.5 cm, and can also determine the hardness of stones through CT values. It can be a good way to know whether there are stones, the size, location, hardness of stones and the presence of hydronephrosis and the severity of hydronephrosis. It can also show the condition of bilateral kidneys and ureters for comparison and observation. Nowadays, CT examination has become a routine examination for the diagnosis of urinary stones, especially for deciding the treatment plan. CT examination is not suitable for pregnant women.