Drainage methods for patients with severe hydronephrosis generally include two kinds: 1) ureteral stenting, which is commonly known as double J tube, is used to enter the renal pelvis from the bladder, so as to drain the fluid and urine from the renal pelvis, and achieve the purpose of restoring renal function or relieving the obstruction; 2) localized pelvic fistulae are used to drain the fluid for patients with more severe hydronephrosis, and there is serious turbidity of the urine or combined with obvious infections. Pelvic fistula is a method to drain the fluid. Of course, in the drainage process must pay attention to the occurrence of complications, these two methods in the drainage of hydronephrosis, dynamic observation of the changes in renal function and drainage fluid, found that the problem is promptly corrected, and at the same time, according to the patient’s drainage of water, to take the tube or long-term retention for a period of time.