Objective: to observe and analyze the changes of surface electromyography monitoring data after Percutaneous Lasers Disk DeoomPression (PLDD ) treatment of Lumbar disc herniation(LDH) and investigate the correlation between the electromyographic regularity of trunk and the therapeutic efficacy of PLDD. Method: select from Mar. 2015 to Apr. 2016 in 36 cases of LDH patients treated with PLDD in Gansu Provincial Hospital of TCM, and to monitor those patients in the period of intraoperation, postoperative surface electromyography (sEMG) and surface electromyographic biofeedback. The subjects underwent the sEMG monitoring of paraspinal muscles using long contraction state, motorial state and static position state respectively,The mean frequency slopes (MFslope, MFs), the flexion extension ratioratio (FER)and mean electromyogram amplitude were measured in both the epileptic and contralateral sides of paraspinal muscles, and organized the test data for statistical analysis. Results: the attenuation of MFs in the epileptic side of MFs decreased significantly compared with that before treatment (P<0.05) in 1 month,3 months and 6 months after the PLDD, while there was no obvious change in the attenuation of the contralateral side; there was no significant change in mean EMG amplitude of contralateral side after PLDD, and the amplitude of the epileptic side increased, but the difference was not remarkably. the epileptic side FER=0.46±0.13, and FER=0.89±0.19 before treatment, the difference was conspicuous (P<0.05), the attenuation of FER in contralateral side was not striking changed. Conclusion: percutaneous lasers disk deoompression in the treatment of lumbar disc herniation can significantly improve paraspinal muscle fatigue, dysfunction, dysequilibrium and other pathological status, and effectively restore the intensity、equilibrium and coordination of paraspinal muscle; It is of clinical significance for efficacious evaluation of sEMG monitoring and prognosis of the disease after LDH treatment.