Abstract:[Objective] To investigate the clinical outcomes of unilateral biportal endoscopic decompression (UBED) versus channel de-compression (CD) in the treatment of lumbar spinal stenosis (LSS). [Methods] A total of 60 patients with LSS who met the criteria were in-cluded in this study. According to doctor-patient communication, 27 patients were treated with UBED, while other 33 patients were treatedwith CD. The perioperative, follow-up and imaging data of the two groups were compared. [Results] The corresponding operation was suc-cessfully completed in both groups. The UBDE group proved significantly superior to the CD group in terms of operative time [(45.9±7.6)min vs (54.4±2.9) min, P<0.001], opioid consumption 3 day postoperatively [(215.6±49.3) mg vs (260.4±67.5) mg, P=0.006], CRP 1 daypostoperatively [(15.6±3.7) mg/L vs (17.9±2.1) mg/L, P=0.004], postoperative ambulation time [(1.2±0.4) days vs (1.6±0.2) days, P<0.001],postoperative hospitalization [(5.1±1.3) days vs (6.0±0.8) days, P=0.002]. The VAS and ODI scores in both groups were significantly de-creased over time (P<0.05), and ODI scores in the UBED group were significantly better than that in the CD group 2 months after surgery(P<0.05). Regarding to imaging, the spinal canal area significantly increased in both groups after surgery (P<0.05). The paravertebral mus-cle cross sectional area (CSA) in the UBED group remained unchanged (P>0.05), while which in the CD group was significantly decreasedover time (P<0.05). There was no significant difference in spinal canal area between the two groups at corresponding time points (P>0.05),and CSA in the UBED group was significantly higher than that in the CD group at all corresponding time points after surgery (P<0.05).[Conclusion] Both UBED and CD are effective methods for the treatment of LSS. By comparison, the UBED takes advantages of reducingthe amount of postoperative anesthetic drugs, intraoperative tissue injury and postoperative inflammation over the CD.