Kidney stone is a common disease in urology. For 7mm kidney stone, extracorporeal shock wave lithotripsy is generally preferred for treatment. Extracorporeal shock wave lithotripsy is safe, effective and less traumatic to the human body, mainly by focusing high-frequency energy on the stone, the stone will be broken under the action of high-frequency energy, the stone can be discharged out of the body with the urinary system itself. If the lithotripsy is unsuccessful, it can be done 2-3 times with an interval of two weeks each time. In addition, if there is obstruction in the urinary system, such as obstruction at the distal end of the stone, extracorporeal shock wave lithotripsy is generally not possible in this case. In the process of treatment, attention should be paid to the application of antibiotics, which can prevent and treat urinary tract infections.