After surgery for prostate enlargement, either open surgery or transurethral surgery, a urinary catheter needs to be retained after surgery. The time of indwelling urinary catheter is as follows: 1, open surgery: the time of indwelling urinary catheter is 5-7 days, due to the presence of trauma and incision in the urethra and bladder, the catheter is usually removed in about 7 days to avoid leakage of urine; 2, transurethral surgery: for example, transurethral prostate electrocision and laser surgery, the time of indwelling urinary catheter is relatively shortened, and the catheter can be removed in about 3-4 days. In addition, the specific time of indwelling urinary catheter should also be decided according to the patient’s situation, such as the patient has been indwelling urinary catheter before the operation, the recovery of bladder function takes time, so the patient needs to be trained for a period of time before removing the catheter. If the original indwelling catheter time is 3 days, this time should be extended by 1-2 days, or even 1 week. If the patient’s prostate is large, the operation time is longer, and the urethral edema is more serious, the indwelling catheter time should also be extended.