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Objective To explore the effect of extracorporeal shock wave lithotripsy(ESWL) for the postoperative residual bilestone of choledocholithiasis.Method Inject contrast medium of biligrafin via T tube.After accurate apposition with X ray,take lithotripsy with extracorporeal shock wave. In some cases T tube washing and transcutaneous choledochoscope were used to take out bilestones.Results The lithotripsies were successful in all the 48 patients and the lithotriptic rate was 100% .The removing rate of bilestones was over 90% with washing method.Choledochoscope was used in 6 cases,and 48 patients were completely healed.In them 24 suffered from slight expanding pain in right upper abdomen or nausea and no any complications and sequelae in others.Conclusion ESWL is an effect method to heal patients with the postoperative residual bilestones of choledocholithiasis.