Lower bile duct stones are generally referred to as lower common bile duct stones, which are more likely to cause cholangitis and cholangitis of biliary origin than intrahepatic bile duct stones and other parts of the common bile duct, and therefore have certain special clinical treatment. For stones in the lower part of the common bile duct without clinical symptoms, surgery can usually be performed at an elective stage. Depending on the size and number of stones, choledochotomy choledochoscopy or ERCP is chosen to remove the stones. In the case of cholangitis caused by stones in the lower bile duct, combined antibacterial drugs, antispasmodic and analgesic treatment can be given first to improve the symptoms, and then surgery or interventional treatment can be performed at a later stage. In case of acute septic obstructive cholangitis, surgical treatment, including choledochotomy, T-tube drainage, and nasobiliary drainage, should be performed on the basis of active preparation for non-surgical treatment. Elective stone extraction should be considered after the clinical symptoms have resolved, usually in about 1-3 months. As for the resulting biliary pancreatitis, if the condition is severe or the general condition is too poor to tolerate surgical treatment, endoscopic sphincteroddiotomy, stone extraction or nasobiliary duct drainage should be performed as early as possible or on an emergency basis on the basis of active medication.