Ureteral flexible mirror to remove kidney stones is belong to a clinical treatment for larger stones, the specific process mainly includes disinfection, anesthesia, guidewire placement, ureteral flexible mirror placement, lithotripsy treatment, and retaining DJ tube. 1. Disinfection: Disinfection around the urethra extends to 15 cm, and a hole towel is spread after disinfection. 2. Anesthesia: Intravenous drugs were injected for general anesthesia treatment. 3. Guidewire placement: guidewire is placed via ureteral rigidoscope. 4. Ureteral flexible mirror insertion: first, insert the flexible mirror sheath tube through the guide wire, and then insert the ureteral flexible mirror through the sheath tube to reach the stone site. 5. Lithotripsy: laser device is inserted into the ureteral flexible mirror and laser lithotripsy is performed under the observation of the flexible mirror, and the stone is taken out through the net after lithotripsy. 6. Indwelling DJ tube: After the operation, a DJ tube is indwelling in the ureter. Observe the recovery of the surgical area during the postoperative recovery period. Once bleeding and low back pain occur, it is necessary to consult a doctor for observation and standardized treatment under the guidance of the clinician.