If the kidney can be treated with lithotripsy, it needs to be decided according to the patient’s specific condition. 1. If the kidney is diagnosed to have fluid due to the presence of stones, then extracorporeal shock wave lithotripsy is needed, only after the stones are broken, the obstruction caused by the stones disappears, and the urine produced by the kidney will be discharged smoothly through the ureter, which will not cause fluid in the kidney. 2. Therefore, this situation must be lithotripsy or surgery to remove the obstruction and treat the hydronephrosis. 2, if there is hydronephrosis first, and the hydronephrosis reaches a certain level and a certain time after the formation of secondary stones, then the lithotripsy treatment is not effective, because the hydronephrosis is the primary lesion and the stones are secondary to the hydronephrosis lesion. If the fluid accumulation is prolonged, the precipitated material in the fluid will gradually form stones. In this case, even if lithotripsy is performed, the stones cannot be discharged from the body. In this case, treatment of hydronephrosis is needed to restore the patency of the urinary tract, and then lithotripsy or lithotripsy treatment can be performed during surgery.