To observe the effects of Weizhong (BL40),Ququan (LV8) acupoints and some sham acupoints acupuncture on lumbar temperature change of mild and moderate lumbago patients with thermal infrared imager.Methods:A randomized control trail was applied in this study,in which 75 students from Beijing University of Chinese Medicine who suffered mild and moderate lumbago and scored below 50% of the Oswestry Index (ODI) were divided into three groups,among which 25 patients were in the experiment group (acupuncturing Weizhong (BL 40)),25 patients were in the first control group (acupuncturing Ququan (LV8)),and 25 patients were in the second control group (acupuncturing sham acupoints).The lumbar temperature changes were observed separately before acupuncture,and 2 minutes,5 minutes,10 minutes,15 minutes,20 minutes,25 minutes,and 30 minutes during acupuncture,and 5 minutes after acupuncture with thermal infrared imager.Results:The lumbar temperature of patients among all the three groups were improved,of which temperature of the experiment group improved more and lasted longer than the other groups (P<0.05),and the lumbar segments L3~L5 showed more obvious temperature improvement than other parts of the body.Conclusion:Both acupuncturing Weizhong (BL40) and other points around the knee improves the lumbar temperature,but acupuncturing Weizhong (BL40) improves more and lasts longer.