1.B ultrasound examination: Urological ultrasound examination is preferred because it is simple, convenient, safe without radiation, high stone detection rate, and can understand stone size, quantity, hydronephrosis and the condition of ureter and bladder at the same time. Disadvantages: human factors have a large influence, and the skill of the examiner is closely related, and the judgment of large stones and multiple stones is not good. 2.X-ray examination: whole urinary tract plain film, convenient, simple, the size, number and location of stones are clearly displayed, but uric acid stones cannot be visualized in the plain film. Disadvantages: radiation, children and pregnant women are affected and should not be used. 3.Intravenous pyelography: can understand the size, location and number of stones, as well as the function of the kidneys; Disadvantages: contrast allergy is prohibited, there is radiation, relatively high cost, hospitalization is required. 4.CT, MRI: can more comprehensively understand the size of the kidneys, kidney stones, renal parenchyma and surrounding organs. MRI is more suitable for pregnant women who are allergic to contrast agents or cannot access X-rays. Disadvantages: radiation, high cost, inconvenient examination, some hospitals do not have the conditions for examination.