Ureteral stent implantation for hydronephrosis is generally a minor surgery. When hydrocele is treated by placing a ureteral stent, it mainly serves as a drainage and support to prevent kidney function damage. Adequate drainage of hydronephrosis to drain the fluid into the bladder and out of the body through the urethra is a relatively common minimally invasive procedure and is not considered a major surgery. In the ureteral stent drainage of hydrocele, the flexible hose, i.e. double J tube, is usually used. The hose can be removed from the body through cystoscopy after 1 to 3 months, which will not cause much damage to the body and the recovery after the operation is relatively fast. However, in the process of drainage, there is a possibility of infection and bleeding, etc. It is necessary to pay attention to avoid urinary tract infection, and antibiotic drugs, such as amoxicillin, cefadroxil, levofloxacin, etc., can be taken to prevent or fight infections. Patients with hydronephrosis should cooperate with doctors to take treatment in time to improve renal function.