Intrahepatic bile duct stones 0.8cm*0.5cm are hepatic bile duct stones and are associated with biliary tract infections and biliary stasis. Involving a variety of pathologies and clinical manifestations, they are usually asymptomatic and untreated, and surgery is performed when necessary. Intrahepatic bile duct stones are most commonly found in the left outer lobe of the liver and the right posterior lobe of the liver, due to the special anatomical relationship between the hepatic ducts of the two liver lobes and the confluence of the common hepatic duct, which leads to poor bile drainage. Pathologic changes include hepatic bile duct obstruction, intrahepatic cholangitis, and intrahepatic cholangiocarcinoma. Clinical manifestations are acute cholangitis causing chills, abdominal pain, and high fever. Except for the combination of extrahepatic choledocholithiasis and bilateral hepatic choledocholithiasis, there may be no jaundice if it is limited to a certain liver segment or lobe. Generally asymptomatic bile duct stones can be left untreated. Recurrent clinical symptoms should be treated surgically, including choledochotomy, bile-intestinal anastomosis, and hepatectomy. Intrahepatic bile duct stones need to be treated as soon as possible to avoid aggravating the condition.