Abstract: The study investigated the practical value of cholangioscopy in operation of bile duct stones. The study analysed 107 cases undergoing poerations of bile duct stones with cholangioscopy. Before cholangioscopy examination residual stone rate of intrahepatic duct stone and extrahepatic duct stone operation was 94% and 15% respectively. After cholangioscopy examination residual stone rate was 19% and 4% respectively. After the operation,the study used cholangioscopy to remove residual stone of average 3.8 times per person for those without cholangioscopy in operation, but for those with cholangioscopy in operation, only twice per person. Applieation of cholangioscopy in operation of bile duct stones is an effective method for reducing the residual stone rate.

Key words: cholangioscopy, bile duct stones, residual stone rate