[Objective]:To discuss the clinical effective of the treatment of severe bony Bankart lesion by Double-Pulley technology in arthroscopy surgery.[Method] According to the CT + 3D reconstruction imaging data of shoulder joint, 14 patients with severe bony Bankart lesion and complete fracture block were collected from January 2017 to January 2019 in our hospital. The all patients were treated by Double-Pulley technology in arthroscope.One suture anchor was implanted in the medial side of the defect glenoid, and two suture anchors were implanted in the lateral side. Then four loops perpendicular to the defect surface were made to fix them by external knotting .Postoperative follow-up ranged from 12 to 36 months, with an average of 23.2months .Assessing the efficacy by shoulder range of motion （flexion and abduction 90 °external rotation angle）， VAS score, Rowe score and Constant-Murley score in preoperation and postoperative,and reconding the outcomes of pre-operation and the last follow-up. [Results] All patients were visited.The flexion angle（161.50 ±4.22）°and abduction 90 °external rotation angle （61.29±5.50）°in preoperative were similar with The flexion angle（162.71±6.70）°and abduction 90 °external rotation angle （62.71±6.49）°in postoperation.There were no significant statistical difference. The VAS score in postoperation (1.89 ± 0.75) was significantly lower than that in preoperation (6.36 ± 0.78), the difference was statistically significant (P < 0.05).And in postoperation, Rowe score (82.86 ± 7.26), constant Murley score (83.07 ± 7.98) were significantly higher than those in preoperation (82.86 ± 7.26), constant Murley score (59.79 ± 5.31), and the difference was statistically significant (P < 0.05). [Conclusion] Treating severe bony Bankart lesion with Double-Pulley technology in arthroscopy is effective and is worth to popularize in clinic.