It is recommended to go to the hospital for further examination and evaluation of the kidney stone after surgery to clarify the cause and then treat it symptomatically.1. If the kidney stone is still not fully recovered after surgery, no treatment is needed, continue to observe and wait for the kidney water to gradually disappear after full recovery. After kidney stone surgery, a ureteral stent tube is usually placed, during which the fluid gradually drains and the amount of fluid can gradually decrease or disappear, but there may be a small amount of fluid before complete recovery, which is a normal performance. 2. Secondary ureteral stenosis or pelvic stenosis after surgery can lead to hydronephrosis, which is often caused by damage to the relevant parts during the lithotripsy process. It is recommended that a ureteral stent tube be placed to adequately drain the hydronephrosis, and that the tube be removed at a later date to observe the changes in the hydronephrosis, and if necessary, even an incision to remove the stenosis, pyeloplasty or end-to-end ureteral anastomosis is required to deal with the cause of the hydronephrosis. 3. In this case, extracorporeal shock wave lithotripsy or secondary surgery can be considered to remove the residual stones and then the hydronephrosis can gradually disappear.