Common bile duct stones are a common and frequent disease in clinical practice, especially in postoperative patients with gallstones. In the past, this type of disease was treated surgically in hepatobiliary surgery, and B-tube drainage was required for one month after X. Since the introduction of the technology of minimally invasive endoscopic treatment of bile duct stones (ERCP), more and more patients with bile duct stones are benefiting from it. However, there are still many patients and even doctors who know little about ERCP as a minimally invasive procedure. Here I will briefly introduce you to ERCP bile duct lithotripsy. The procedure is done under the duodenoscope, the duodenoscope is entered through the mouth to the descending duodenum, the duodenal papilla is found, the bile duct is selectively inserted through the papilla by entering the incision knife through the duodenoscope, the direction of the guide wire into the bile duct is seen, the contrast is injected, the papilla is partially incised, if the stone is large, the papilla and the opening of the bile duct can be dilated with a column balloon, and then the stone is removed with a lithotripsy and/or lithotripsy mesh basket and placed in the duodenum If necessary, a nasobiliary drain or bile duct plastic stent can be placed in the bile duct after stone extraction. The patient can be discharged 1-2 days after surgery.