Rheumatoid arthritis (RA) is referred to the category of Bi syndromes in traditional Chinese medicine. It is regarded as an autoimmune disease, but the pathogenic mechanism is still to be clarified. In order to observe the effects of the treatment of RA with acupuncture and moxibustion on IL-2, 41 patients were divided into warming needle and point injection groups at random, and 19 healthy subjects as control group. The results showed that the IL-2 levels in two RA groups before treatment were obviously lower than that in control group (P 0.05). After treatment the IL-2 level in control group was unchanged, but increased considerably in two RA groups (P 0.01). Generally, IL-2 is considered as a very important signal for regulating immune response. Our results have shown that the decrease of IL-2 in patients with RA should be one of main causes of internal environment disorder, acupuncture and moxibustion as a stress stimulation exerts an influence on the immunity system through neuroendocrine system to improve the IL-2 production.