Ureteroscopic lithotripsy is a technical task that requires care and boldness on the part of the surgeon. However, the following complications may still occur and even lead to serious consequences. 1. Failure to insert the ureteroscope into the ureteral orifice or failure to pass through the ureteral wall or obstruction somewhere in the ureteral lumen. This is the most common intraoperative complication that can be easily ignored by the surgeon. Because the ureteral orifice and the ureteral stroke are at an angle, the catheter and guidewire do not enter along the ureter during retrograde intubation, but are inserted into the mucosa, resulting in injury; ② The ureter is twisted at an angle There are several corners in the normal anatomical stroke of the ureter, such as the ureteral bladder junction, the ureter crossing the iliac artery, and the upper ureter twisted and twisted due to hydronephrosis and stone impaction. The upper part of the ureter is twisted and angled due to hydronephrosis and stone impaction. When the guidewire is inserted retrograde in these areas, once the guidewire cannot travel in accordance with the angle of the ureter, so that the head of the guidewire is against the mucosa, then, if the operator continues to insert it forcibly, it can often cause mucosal injury and false passage. Submucosal injury is a minor ureteral injury, and if it is detected in time, the guidewire or catheter is withdrawn and placed back into the correct ureteral lumen under the ureteroscope, there is no harm to the patient. 3, ureteral perforation Ureteral perforation occurs in 2% to 17%, with an average of 4.4%. With the skillful operation of ureteroscopy, the incidence of ureteral perforation is gradually decreasing. If the perforation is too large or the internal stent tube is not effective, percutaneous nephrostomy or open surgery is feasible to repair the perforation. 4. Bleeding After ureteroscopic lithotomy, light red urine is usually drained, which usually turns clear after 1 to 3 days. In principle, it does not require any special treatment. 5.Fever Most of them show low fever, and some of them with preoperative combined urinary tract infection may have high fever after surgery due to reflux infection caused by intraoperative perfusion. 6. Ureteral stricture Its a distant complication. Gentle operation and prevention of injury and infection are the methods to prevent the occurrence of ureteral stricture.