Postoperative catheterization has three implications: to promote the alignment and healing of the bladder neck and urethral anastomosis. Through the guiding effect of the catheter, the bladder neck and urethral anastomosis can be aligned in a straight line, and after being left in place for a period of time (usually 7-12 days), the anastomosis there can heal more ideally. Postoperatively, it is advantageous to calculate the urine volume. Postoperative urine is passed through the catheter and collected in the drainage bag, which facilitates the calculation of the daily urine volume. It is convenient for the surgeon to observe the change of urine color and volume. Postoperative conducive to urinary catheterization. Generally, within 3-5 days after surgery, patients are weak and have poor ability to get out of bed, so they cannot walk to the toilet frequently to urinate, and at the same time, they need intravenous rehydration fluid after surgery, and the process of hanging rehydration fluid also restricts patients’ activities on the ground.