ObjectiveThe significance of intra or postoperative choledochoscopy in selecting propersurgery for biliary disorders was evaluated. MethodsThe clinical materials of 182 patients undergoingcholedochoscopy were reviewed.Results The rate of residual stones dropped from 35.2 to 9.7 percent in134 cases with choledocholithiasis.With the scopy residual stones were extracted in 12/13 patients , biliarymenbranous stenosis being dilated in 15/30 and the cause of malignant obstruction of lower common bile ductelucidated in 24 instances . Conclusion Intraoperative choledochoscopy is beneficial in the choice of ap-propriate operation for biliary disorders as well as in establishing correct diagnosis that is ambiguous beforesurgery.