Flexible ureteroscopy, also called flexible ureterorenoscopy, is a new technology that has emerged in recent years in urology, not only for the diagnosis of upper urinary tract diseases, but also for the treatment of certain upper urinary tract diseases, especially stones. The flexible ureterorenoscope is slim and soft with a diameter of 2mm (about the size of a matchstalk), which can be easily passed through the ureter via the ureter and reach the kidney directly. The head end of the mirror can be bent up/down 270 degrees under the operator’s control, which can observe and deal with the renal pelvis and calyces that cannot be reached by the ureteral rigidoscope, and at the same time, it can solve the shortcomings of the traditional ureteral rigidoscope that some stones can be seen but not hit, and the degree of stone crushing is high. It is currently the main treatment method for kidney stones below 2 cm, but there are many cases of stones above 2 cm that have been successfully fragmented by ureteral flexible scopes. In addition, for some special cases, such as isolated kidney, horseshoe kidney, bleeding tendency, spinal deformity, renal insufficiency, iodine allergy, rare blood type (RH negative blood, commonly known as “panda blood”), etc., ureteroscopy has unique advantages. With the enhancement of the general public’s health awareness and the implementation of universal medical insurance, the diagnosis of urinary stones is more and more inclined to “miniaturization”, and ureteroscopic lithotripsy will become a “powerful tool” in the minimally invasive treatment of urinary stones, reducing the immediate and long-term damage to patients with stones. Ureteroscopic lithotripsy will become a “powerful tool” in minimally invasive treatment of urinary stones, reducing the immediate and long-term damage of stone patients and bringing “gospel” to the general public!