Urolithiasis is a common and frequent disease in urology, and patients with urolithiasis account for about 1/3 of urological inpatients. In recent years, the incidence of kidney stones and ureteral stones has gradually increased, and the conventional treatment methods mainly include extracorporeal shock wave lithotripsy, percutaneous nephrolithotripsy and ureteral rigid lithotripsy, etc. All of the above methods have their own shortcomings, such as low lithotripsy clearance rate, long lithotripsy cycle, repeated lithotripsy easily causing kidney damage, etc.; percutaneous nephrolithotripsy is very traumatic and has the risk of haemorrhage and infectious shock. Ureteroscopy cannot be bent, and cannot deal with pelvic and calyx stones and residual stones after the above-mentioned surgery. The rise of ureteral flexible scope and its powerful advantages make it make up for the shortcomings of traditional methods. The flexible ureteroscope is slim and soft, with little damage to the ureteral and pelvic mucosa, and the end of the mirror can be bent up and down 180 to 270 degrees, which is convenient for observing and treating pelvic and calyx stones, especially when treating calyx stones that cannot be observed and treated with a rigid mirror. Holmium laser is a laser fiber that can be bent at will. Under the guidance of cystoscope and ureteroscope, the holmium laser is directed at the stone through the urethra and ureter and along the urinary tract to break it up. The detachable combination ureteral flexible mirror overcomes the fragility and high cost of use and maintenance of the one-piece ureteral flexible mirror. It consists of a reusable fiberoptic system, and a single-use, sterile packaged, bendable, multi-channel endoscopic trocar. The detachable nature of the mirror allows the operator to replace damaged components whenever necessary, avoiding interruption of the procedure. The optical system uses a single fiber optic imaging technology, which not only improves the clarity of imaging, but also does not cause black spot phenomenon or honeycomb vignetting due to partial fiber breakage, etc.