[Abstract] OBJECTIVE: To investigate the method, technique, influencing factors and preliminary efficacy evaluation of intraoperative preservation of the lumbar interlaminar ligament in posterior microendoscopic lumbar discectomy. METHODS: Seventy-eight patients with single-segment microendoscopic lumbar discectomy were selected for trial intraoperative preservation of the interlaminar ligament, and grouped according to whether the preservation of the ligament was successfully implemented (group A: preservation group; group B: abandonment group). The age, disease duration, pathological staging, lamina gap size, mean operative time and intraoperative bleeding of the two groups were compared, and the surgical methods and techniques were summarized, and the visual simulation scoring method and The surgical results were evaluated using visual simulation score and lumbar spine dysfunction index. Results: There were significant differences in age, disease duration and lamina gap size between the two groups by t-test, while there were no differences in pathological staging of disc herniation by chi-square test and no significant differences in operation time and intraoperative bleeding by t-test.