Whether the damage to the kidney of hydronephrosis pumping treatment is big or not needs to be decided according to the way of pumping, if percutaneous nephrolithotomy fistula is used to pump and drain the kidney, there will be some damage to the kidney, the thicker the diameter of the fistula tube the greater the damage to the kidney, which can cause renal parenchyma destruction, hemorrhage, and loss of effective renal units. If the tube is left in place for a longer period of time, the thicker the tube is the greater the damage to the kidneys is likely to be. However, if the ureteral stent tube drainage is used to drain the fluid from the kidneys there is no damage to the renal parenchyma because at this time there is no need to cut nor to make a channel through the kidneys, but only need to put in a tube in the ureter into the kidneys to drain the fluid, so there is no damage to the renal parenchyma. However, the treatment of hydronephrosis, such as pumping or drainage, is only the symptomatic solution, not the root cause, which can temporarily relieve the hydronephrosis, but ultimately need to treat the cause of hydronephrosis in order to achieve the goal of a complete cure.