Objective To discuss the safty and reliablity of Clean Intermittent Self-catheterization(CISC)in reducing lower urinary tract infection(LUTI)among the patients suffered from chronic urinary.Methods 40 cases of patients with chronic urinary retention were randomly divided into 2 groups.The observation group was dealt with CISC while the control group had bladder fistulization.Urinalysis and urine culture a month later were reexamined to observe postoperative urinary tract infections situation.Results The uri...