Abstract:[Objective] To compare clinical efficacy of biportal endoscopic lumbar interbody fusion (BE-LIF) versus conventional hemilamiectomy lumbar interbody fusion (HL-LIF) for degenerative lumbar diseases. [Methods] A retrospective study was done on 78 patients who received surgical treatment for lumbar degenerative diseases in our hospital from March 2022 to November 2022. According to the results of doctor-patient discussion, 35 patients received BE-LIF, while other 41 patients underwent HL-LIF. The perioperative period, follow-up and auxiliary examination were compared between the two groups. [Results] Although the BE-LIF cohort consumed significantly longer operative time than the HL-LIF cohort, the former proved significantly superior to the latter in terms of incision length [(7.1±1.0) cm vs (11.5±2.2) cm, P<0.001], intraoperative blood loss [(240.0±121.2) ml vs (344.9±140.9) ml, P<0.001], postoperative walking time [(3.2±0.5) days vs (4.4±0.5) days, P<0.001]. With time of the follow-up lasted for (15.8±2.3) months in a mean, the VAS, ODI and JOA scores in both groups significantly improved (P<0.05). The BE-LIF group was significantly better than the HL-LIF group in terms of low back pain VAS [(1.4±0.5) vs (1.8± 0.7), P=0.005], ODI [(15.3±2.5) vs (16.7±3.2), P=0.039] and JOA score [(25.3±1.0) vs (24.2±1.5), P<0.001] 5 months after surgery. As for imaging, the intervertebral space height and the lumbar lordosis were significantly increased in both groups after surgery (P<0.05). However, there were no significant differences in intervertebral space height, lumbar lordosis and intervertebral fusion Bridwell grade between the two groups at any time points accordingly (P>0.05). [Conclusion] Both of the lumbar fusion methods achieved good clinical outcomes. By comparison, the BE-LIF takes advantage of minimally invasive surgery, with less pain in early stage after operation and faster function recovery over the HL-LIF.