INTRODUCTION: Surgical treatment for trigger finger is generally performed by open method. We performed endoscopic assistted release of A1 pulley as one of the minimum invasive surgery. In this study, endoscopic pulley release(EPR) was performed for trigger fingers and thumbs, and the clinical results were followed-up. METHODS: Twenty-two fingers and thumbs in twenty patients (15 women, 5 men) with trigger finger and thumb were treated with EPR method. Their average age at surgery was 59.5 years (range, 47 to 77). All surgeries were performed under local anesthesia. Make two skin incision on the flexor tendon. Separation of the flexor tendon and subcutaneous tissue was performed using curved dissector. The slit cannula was inserted subcutaneously from proximal portal to distal one. A 2.7mm in diameter, 30 light post opposite endoscope was inserted from proximal portal. A rasp and a probe were used to identify the A1 pulley. The A1 pulley was dissected from proximal edge to distal portion by using a hook knife. Finally patients confirm a loss of trigger phenomenon at their grasp. Suture was not performed at skin incision site. The average follow-up period was 1years (range, 0.5to 2). Loss of trigger phenomenon, relief of pain, pain of scar, complications, mean surgical time and mean period of change of dressing were evaluated. RESULTS: Snapping phenomenon was relieved in all cases. 1 case had pain on motion after surgery. Mean surgical time was 13.4min. and mean time of removal of the dressing was 5days after surgery. No patient had pain of scar and complications. DISCUSSION AND CONCLUSION: Two surgical procedure are reported as minimum invasive surgery for trigger finger. One is percutaneous release and the other is endoscopic release. But endoscopic pulley release is able to release of A1 pulley completely without tendon injury. Endoscopic pulley release was considered to be one of the useful minimum invasive surgical procedures for trigger fingers and thumbs.