Hydronephrosis is one of the complications of ureteral calculi, which is mainly caused by stones blocking the ureter and the water in the kidney cannot be discharged. The treatment of hydronephrosis caused by ureteral calculi can be achieved by the following methods: 1. Fistulation and drainage. When obstruction causes severe hydronephrosis, fistulation and drainage should be performed first. Second, local treatment can be used to solve the pathological changes in the obstruction site, such as adhesion separation, fiber cord cutting, vascular transposition anastomosis, stone removal, etc. When the local compression time is too long and the local development of ureter is seriously damaged, this section of ureter should be removed and anastomosed again. Third, plastic surgery must master the main points of plastic surgery, so that the ureteropelvic anastomosis is at the lowest point of the renal pelvis. Pyeloureteropelvic anastomosis should be funnel-shaped. When repairing, the surrounding fibers, adhesions and scar tissues should be removed, but the blood supply should not be destroyed. Remove the redundant renal pelvis wall and maintain a certain renal pelvis tension. If the hydronephrosis of ureteral calculi is too large, the thin renal cortex can be folded and fixed to reduce the renal internal volume. In order to reduce the leakage of urine at the anastomotic site, double pigtail catheters can be placed. In order to avoid scar fibrosis caused by urine leakage and hemolysis stagnation around the anastomosis, a negative pressure suction tube can be placed outside the anastomosis to fully drain. There are many plastic surgery methods, but at present, considering the etiology and pathology, it is better to remove the diseased segment and then anastomose it.