By analyzing and comparing the infrared radiation spectrums of the traditional moxibustion, the substitute moxibustion and acupoints, it was found that there was a surprising consistency in the spectrums of three types of indirect moxibustion, namely separated with prepared daughter root of common monkshood, ginger and garlic, and the unified spectrum of acupoints of human body. Both had their peaks of radiation near 7.5μm. However, the spectrum of the substitute moxibustion was completely different from them. Its warming function was far less than the traditional moxibustion. And there was also a big difference between the infrared radiation spectrums of the moxa stick smoking and acupoints. The result indicates that in the therapeutic effect of traditional indirect moxibustion the sympathetic vibration of infrared radiation of indirect moxibustion and acupoints play an important role and the substitute moxibustion could not replace the traditional moxibustion in terms of the infrared characteristics of moxibustion.