Indwelling catheters are very commonly used in clinical practice and are a very effective treatment. This is especially true for patients with prostate enlargement, which often causes difficulty in urination or inability to urinate. The indwelling catheter can significantly relieve the patient’s symptoms. There are several procedures for the indwelling catheter: first, the patient should lie flat, and then the perineum (especially the urethral opening) should be fully disinfected; second, the sterile catheter kit should be opened, and then the catheter should be fully lubricated with lubricant, which is to avoid damage to the male urethra during the insertion of the catheter; third, one hand should hold the male penis up, and the other hand should hold the distal end of the catheter with forceps and insert the catheter Insert the catheter into the urethra, in the process of insertion must be gentle, do not force too hard, and can not be inserted too fast, can reduce the damage to the urethral mucosa; four, when you see the urine from the urethral tube after the outflow, proved to have entered the bladder, at this time with a sterile syringe to draw saline, the urethral tube balloon inflated 5-10ml of liquid, connected to the drainage bag can be.