Abstract： Objective： To observe the clinical effect of superficial needling on lumbar and back myofascial pain syndrome，and its influence on lumbar function and pain. Methods：A total of 97 patients with lumbar and back myofascial pain syndrome were selected as the study subjects and divided into the control group(48 cases) and the observation group(49 cases) by random number table method. The control group was treated with ordinary acupuncture， and the observation group was treated with superficial needling. The clinical effects， Chinese medicine syndrome scores， electromyographic characteristics of the surface of painful side of lumbar core muscle，lumbar function and pain before and after treatment were compared between the two groups. Results：After treatment，the total effective rate was 87.76% in the observation group，higher than that of 64.58% in the control group(P＜0.05). After treatment，the scores of Chinese medicine syndromes，Present Pain Intensity(PPI)，Pain Rating Index(PRI)，Visual Analog Scale (VAS)，Oswestry Dysfunction Index(ODI) and Ro- Land- Morris Dysfunction Questionnaire(RMDQ) in both groups were all decreased when compared with those before treatment(P＜0.05)，and the above scores in the observation group were lower than those in the control group(P＜0.05). After treatment，the levels of force- displacement distance(FDD) of erector spine and multifidus and the levels of median frequency(MF) of painful side of iliocostus， longisus and multifidus muscles were increased when compared with those before treatment，and the above levels in the observation group were higher than those in the control group (P＜0.05). Conclusion： Superficial needling has an accurate therapeutic effect on lumbar and back myofascial pain syndrome， which can effectively improve the electromyographic characteristics of the surface of painful side of lumbar core muscle and lumbar function of patients，and relieve their pain.