Abstract: Using biliary-contrast and biliary-endoscope to reduce the morbility of residual stone in the biliary tract during the operation. 446 cases of simple gall bladder stone treated from Jan 1987 to Dec 1997 were reviewed. All the patients underwent the intraoperative cholangiography, 139 cases were positive. The 139 cases underwent common bile duct exploration, choledochoscope was applied in 56 cases simultaneously. The residual stone in the biliary tract can be avoided by intraoperative cholangiography, the result may be better by applying choledochoscope simultaneously.

Key words: intraoperative cholangraphy, choledochoscopy, residual calculus