The catheter can be removed about three days after normal ureteral flexible lithotripsy surgery, if the bleeding is more serious or there is damage to the urethra, the time for removing the catheter may be prolonged appropriately. Ureteral flexible mirror surgery is a minimally invasive surgery, less harmful to the human body, if there is no obvious bleeding and urethra damage, the catheter will be removed normally three days after the surgery. If the bleeding is more serious, the time of catheter removal can be extended appropriately. If the time of catheter removal is too early, the blood will not flow out and clots will easily form to block the bladder. If there is damage to the urethra, it is necessary to extend the time of removing the catheter. If the time of removing the catheter is too early, it is easy to lead to the narrowing of the urethra, which will cause difficulty in urination. Therefore, after ureteral lithotripsy surgery, the appropriate time to remove the catheter should be chosen in conjunction with the patient’s recovery status and the situation at the time of surgery. If the patient has any discomfort, he/she should consult the doctor for examination and early treatment.