【Abstract】Objective: To evaluate the clinical outcomes of percutaneous lumbar foraminoplasty for for unilateral stenosed nerve root canals. Methods: From May 2016 to April 2017, 32 patients with lumbar spinal stenosis syndrome (unilateral stenosed nerve root canals) were treated with percutaneous endoscopic lumbar discectomy (PTED). During the operation, the eccentric Saw was placed outside the intervertebral foramen, the working sleeve was placed on the ventral side of the upper articular process, and the ventral side of the upper articular process was removed. The hypertrophy of the yellow ligament is removed by nucleus pulposus forceps and plasma. Results: The average operative time was (75. 82±10. 58) min, the average blood loss was (15.83±3.75) ml, and the average hospital stays time after surgery was (6.31±4.50) days. The results of postoperative VAS score (leg and lumbar), ODI were obviously improved when compared with preoperative evaluation (P＜0. 05) which were got on postoperative 1 day, 3 month and Final follow-up time. According to the modified Macnab criteria，the outcome showed: The excellent and good rate was 90.6%. Conclusion: PTED has a satisfactory clinical effect in the treatment of lumbar spinal stenosis syndrome, especially unilateral stenosed nerve root canals; decompress the lateral recess; and relieve the never root symptoms. Eccentric saw foraminoplasty technology can improve foraminoplasty efficiency without reducing the lumbar stability. However, it is still a challenge for patients with bilateral spinal stenosis syndrome.