Objective To observe the effect of electroacupuncture（EA） on lumbar dysfunction and multifidus muscle characteristics in patients with lumbar disc herniation（LDH）. Methods Sixty patients with LDH were randomly divided into an observation group and a control group

30 cases in each group. The patients in the control group were treated with symptomatic treatment. On the basis of the treatment of the control group

the patients in the observation group were treated with acupuncture at L3-S1 Jiaji（Ex-B 2） and Dachangshu（BL 25）

and the ipsilateral L3 and L5 Jiaji point were connected with EA（continuous wave

frequency of 20 Hz

and the intensity was appropriate to the patient’s tolerance）. The needles were retained for 20 min

once every other day

and 10 times were taken as a course of treatment. A total of 2 courses of treatment was given. The modified Oswestry disability index（ODI） as well as the physical component summary（PCS） and mental component summary（MCS） of the 36-item short form health survey（SF-36） were compared between the two groups before and after treatment. Lumbar MRI was performed before and after treatment to measure the cross-sectional area（CSA）

fatty infiltration（FI） and T2 values of multifidus muscle at the lower edge of L4 and L5 vertebral bodies. Results After treatment

the ODI

PCS and MCS socres in the two groups were improved compared with those before treatment（P<0.05）

and the ODI and PCS socres in the observation group were better than those in the control group（P<0.05）. After treatment

the FI and value of T2 in the observation group were lower than those before treatment（P<0.05）

and lower than those in the control group（P<0.05）. Conclusion EA could improve lumbar dysfunction

relieve edema and fatty infiltration of multifidus muscle in patients with LDH.