The following tests are required for urinary stones: 1. Ultrasound of the urinary system, which is convenient, inexpensive, does not require any trauma and does not involve any radiation. It can help to understand the location and size of the stones, the presence of hydronephrosis, ureteral dilatation, etc. 2.Urological CT can help to understand the size and location of the stones, the direction of the ureter, the degree of hydronephrosis, etc. It is not interfered by the gas in the abdominal cavity and can be useful for stones that cannot be detected by ultrasound due to gas interference. However, the cost is relatively high and there is a certain amount of radiation. 3, intravenous urography, which is an indirect method of examination, requires intravenous injection of contrast agent to take X-rays dynamically to observe the stones. The advantage is that the urinary system can be dynamically observed, but the disadvantage is that repeated x-ray imaging is required, with a certain amount of radiation and the need for intravenous contrast.