Percutaneous nephrological technique (PCNL) is an important part of urological surgery and has significant advantages in the treatment of upper urinary tract stones. Microchannel percutaneous nephrological technique (mPCNL) is a new technique to improve the traditional percutaneous nephrological method by reducing the nephrostomy channel to the diameter (F16-F20) and treating kidney stones and upper ureteral stones with holmium laser and other lithotripsy instruments under the direct view of ureteroscope. Most of the early adopters at home and abroad used X-ray positioning for PCNL puncture, we use ultrasound positioning, which has the advantage of avoiding radiological damage to patients and operators. In addition ultrasound can also show X-ray negative stones well; it can also show the internal structure of the kidney, the relationship between the stone and the local calyces, the thickness of the renal cortex, and the adjoining relationship of the kidney. During the process of puncture, it can show the structures through which the puncture path passes throughout, which is easy to judge whether there are adjacent organs such as pleura, lung tissue, and colon on the puncture path, and also provide the distance from the fluid-bearing calyces or collecting system to the skin, for It also provides a reliable basis for the operator to grasp the depth of puncture and expansion. If necessary, Doppler ultrasound is used to observe the presence of large vascular pathways on the proposed channel to avoid accidental injury to the greatest extent possible. Urological stones are common and frequent, and upper urinary tract stones are more dangerous to patients, such as causing damage to kidney function, hydronephrosis with infection, and even urinary sepsis with life-threatening consequences. Our department has been improving its technology to deal with upper urinary tract stones by various minimally invasive methods, among which mPCNL is favored by patients because of its small trauma, high surgical safety, low bleeding, low complications, short hospital stay and high stone removal rate.