Dilatation of the intrahepatic bile ducts and common bile ducts can be treated conservatively and surgically. The causes of dilatation of the intrahepatic bile ducts and common bile ducts include stones, occupations and congenital malformations. There are different treatments according to different causes. 1. Conservative treatment: Conservative treatment is usually possible if no stones or space occupation are found in liver ultrasound and CT examination, and the intrahepatic bile ducts and common bile ducts are slightly dilated, and the patient’s liver function is normal and no obvious symptoms are found. Regularly review the liver ultrasound and observe the changes of the condition at any time. 2. Surgical treatment: liver ultrasound and CT found that stones and tumors occupy the area, leading to obstruction of the common bile duct and dilatation of the bile duct and intrahepatic bile duct above it, surgical treatment should be adopted, and the surgical plan includes: choledochotomy and lithotripsy, endoscopic retrograde cholangiopancreatography and lithotripsy and pancreaticoduodenectomy, etc. Malignant tumors should also be treated according to the pathology and the symptoms. Malignant tumors should also be treated with radiotherapy and other chemotherapeutic agents such as cisplatin according to the pathology. In case of congenital choledochal cystic dilatation, surgery is usually chosen as the mainstay of treatment with internal drainage. Found that intrahepatic bile ducts and choledochal dilatation, it is recommended that patients go to the regular hospital to consult the doctor for the best treatment plan, choose the treatment according to their own condition, and follow the doctor’s instructions for medication. Do not make your own judgment, so as not to make a mistake and miss the best time for treatment.