During the past one and half year we performed ESWL therapy in 13 patients with common bile dust and intrahepatic duct stones applying Lithostar-R (Siemens co, West Germany) and analyzed their results. In 13 patients 9 residual common bile duct stones and 7 intrahepatic duct stones were selected postoperatively. The size of stones were ranged from 0.7cm to 3.5 cm in diameter. 2 stones were multiple and the remained 14 were single in number. The visualization of stones were done with fluoroscopy after the injection of contrast media via cholangiogrgraphic T-tube or ERCP. ESWL were applied continuosly until stone disintegra-tion was visible or upto maximumu number of 3500 discharge of shock wave. If not disinte-grated upto 3500 patientw were underwent second or third lithotripsy session with interval of one week. Our resultw showed that among 9 common bile duct stones 4 were completely disintegrated and passed out spontaneously but 3 partially fragmented and removed by the additional procedure. 2 were failed. Among 7 intrahepatic stones 3 completely and 2 partially were succeeded One stone partially fragmented were retained without removal and other one were failed. Skin petechia in all patients were revealed on the entry port of shock wave but no serous complication was not occured.