Objective: To explore the effect of different concentrations of ropivacaine in lumbar discectomy under intervertebral foramen. Methods: 128 patients with lumbar disc herniation (LDH) were selected and divided into group A (0.1% ropivacaine, n = 40) and group B (0.15%) according to the different concentrations of ropivacaine in lumbar anesthesia Ropivacaine, n = 46), group C (0.2% ropivacaine, n = 42). Observe and compare the changes of sensory nerve block, motor nerve block, intraoperative pain level, muscle relaxation effect and the changes of BP and HR before and after anesthesia, 30 minutes after anesthesia at the end of surgery. Results: (1) There was no significant difference in the onset time and block time of sensory nerve block; the anesthesia level of patients in group C was higher than that of the other two groups, the anesthesia level of group B was higher than that of group A; the duration of anesthesia in group C was significantly higher The remaining two groups, while group B was significantly higher than group A (P <0.05); (2) Motor nerve block onset time was significantly shorter in group C patients than the remaining two groups, and recovery time in group C patients was significantly longer than the remaining two groups At the same time, group B is longer than group A (P <0.05); group C Bromage score is significantly better than the other two groups, and group B is better than group A (P <0.05); (3) group C is significantly better than the other two groups At the same time, group B was significantly better than group A (P <0.05); the muscle relaxation effect of group C was significantly better than the other two groups (P <0.05); (4) There was no significant difference in HR changes at different time points; at 30 minutes of anesthesia, BP in group C was significantly lower than that in the other two groups (P <0.05); meanwhile, BP in groups B and C was significantly lower than before anesthesia (P <0.05). Conclusion: The optimal concentration of lumbar anesthesia under lumbar discectomy under intervertebral foramen is 0.15% ropivacaine, which has the advantages of obvious analgesic effect, light motor nerve block and little effect on hemodynamics.