In order to investigate the influence of bleeding tendency on emergent treatment of postrenal renal failure patients, we retrospectively studied the methods and complications of emergent treatment in 86 renal failure patients induced by postrenal obstruction hospitalized from March 1988 to December 2000. Fourteen patients were treated by emergent open operation, in whom one died after operation because of severe bleeding,and 3 with total bleeding volume more than 1000ml. Thirty nine patients were treated with percutaneous nephrostomy, in whom 2 died after operation and 3 had to undergo mephrectomy.32 patients were treated with retrograde indwelling ureteral stent and one with transureteroscopic lithotomy (TUL),without the occurrence of complications. Emergent open operation and percutaneous nephrostomy for renal failure patients induced by postrenal obstruction may induce uncontrolled renal bleeding,resulting in patient death or kidney loss because of bleeding tendency.The retrograde ureteral catheterization for drainge is recommended as the first option for emergent treatment of renal failure patient induced by postrenal obstruction.