[Objective] To investigate the effect of functional exercise of lumbodorsal muscle on lumbar spondylolysis accompanied with low back pain. [Methods] From August 2018 to December 2020, a total of 94 patients with lumbar spondylolysis complicated with low back pain were enrolled in this study. The patients were divided into two groups according to whether spondylolisthesis was seen on radio- graphs, 59 cases were fall into the non-slippage group, while the remaining 35 cases in the slippage group. Five-point back arch exercise was performed in all patients for 1 month. The changes of pain and function were observed. [Results] Compared with those before treat- ment, both VAS and ODI scores in two groups were significantly decreased after treatment (P＜0.05) , and VAS and ODI scores in non-slip- page group were significantly lower than those in slippage group at corresponding time points (P＜0.05) . After treatment, ROMs of lumbar flexion and extension were significantly increased in both groups compared with before treatment (P＜0.05) . The non-slippage group had significantly greater ROMs of lumbar spine flexion and extension than the slippage group before treatment (P＜0.05) , however, it became not statistically significant after treatment between the two groups (P＞0.05) . [Conclusion] This five-point back arch exercise does relieve low back pain and increase the range of motion of lumbar spine, and has reliable therapeutic effect on spondylolysis complicated with low back pain.