Abstract: The materials of endoscopic sphincterotomy treaing (EST) common bile duct stones (2.0cm in diameter) in 10 cases were reviewed to upgrade EST therapeutic efficacy. Of which 7 had single stone, 3 had multiple stones, 2 with Oddi sphincter inflammaory narrow.1 with chronic cholep-ancreatitis, 1 with acute obstructive suppurative choledochitis (AOSC), and Billroth II postagastrotomy were found in 2. The classen knife or self - designed needleknife was used after ERCP and the length cut-ted was 1. 0 ~2. 0cm. The results showed that EST successful rate 0f 8/10 (80 % ). It is esperienced that appropriate cutting is essential to treat common bile duct stone with EST. The needle knife should be used to make pecuuting followed by the standard knife while insufficient insertion of bow - knife. Front view -gastroscopy can be applied for the patients with Billroth II post - gastrotomy .