Abstract:[Objective] To introduce the surgical technique of 6 o ''clock anchor insertion in labrum for the treatment of anterior shoulder instability under arthroscopy, and to evaluate its clinical efficacy.[Methods] Fifty-one patients who has anterior shoulder instability were admitted from January 1, 2018 to January 1, 2021. All patients who had a definite history of injury was treated by Arthroscopic labrum repair, after their preoperative physical examination showed anterior instability and imaging examination showed no fracture. [Results] All 51 patients were followed up for an average of 18.8 months (12-24 months). There were no statistically significant differences between active forward elevation,and internal rotation after the surgery, postoperative abduction 90o external rotation was 8.5o±4.9o more limited than the normal side, and no postoperative re-dislocation occurred in all patients in the last follow-up. The American Shoulder and Elbow Society (ASES) score increased from (81.04±3.49) before surgery to (92.23±2.62) at the last follow-up,additionally ,the constant-Murley score increased from (90.04±2.90) before surgery to (95.71±1.68) at the last follow-up,moreover,Rowe score by preoperative (64.47 ±6.20) points up to at the time of the last follow-up (92.38±2.33) as well, and all the differences was statistically significant (P<0.01). [Conclusion] Arthroscopy at 6 o ''clock position anchor insertion labrum suture for the treatment of shoulder instability is effective. The success of the operation depends on the strict grasp of preoperative indications, the proficiency of intraoperative arthroscopy and early postoperative rehabilitation exercise.