Bile duct dilatation depends on the cause of bile duct dilatation, compensatory bile duct dilatation does not need special treatment, bile duct dilatation caused by bile duct stones can be treated surgically, bile duct dilatation caused by bile duct tumors can be resected surgically in the early stage, and palliative symptomatic treatment can be provided in the late stage. 1. Compensatory bile duct dilatation: after gallbladder removal, bile ducts will have compensatory dilatation, which belongs to compensatory reaction, no special treatment is needed, and regular review and follow-up can be done. 2. Bile duct dilatation caused by bile duct stones: bile duct dilatation caused by bile duct stones is recommended to be treated by surgery as soon as possible, and the surgical methods are usually choledochotomy and lithotripsy, endoscopic retrograde cholangiopancreatography and lithotripsy, and so on. 3. Bile duct dilatation caused by bile duct tumor: Early stage bile duct tumor can be resected by radical surgery, supplemented with chemotherapy (such as cisplatin, fluorouracil, etc.) and targeted therapy (such as lenvatinib, etc.) after surgery. Advanced unresectable tumors can be treated with chemotherapy, targeted therapy, and should also be treated with choledochotomy or stenting to relieve biliary obstruction. Patients are advised to go to the hospital to find out the cause of bile duct dilatation and treat accordingly under the guidance of the doctor.