Objectives : It is the object of Qigong therapy to promote the circulation of Qi and blood, and to relieve mentality by way of warming lower Danjon. In this study, to prove that Qigong therapy could actually subside heat on upper or middle Danjon and warm the temperature on lower Danjon, we observed the thermal changes of upper, middle, lower Danjon before and after Qigong therapy and compared them. Methods : We selected 16 patients, treated Qigong therapy and examined by D.I.T.I.(Digital Infrared Thermographic Imaging) before and after Qigong therapy, among patients who visited. Qigong clinic, Kangnam Korean hospital, Kyunghee University(Daechi-2dong, Kangnam-Gu) from april to october, 1999. We watched the difference of temperature among upper, middle, lower Danjon before and after Qigong therapy, and used student T-test(paired type, 2 tail) for proving effects of Qigong therapy statistically. Conclusions 1. The difference of temperature$({Delta}T)$ between upper(Ex-HN3) and lower Danjon(CV4) significantly decreased about $0.55^{circ}C$ after Qigong therapy(p<0.01). 2. The difference of temperature${Delta}T$ between middle(CV17) and lower Danjon(CV4) significantly decreased about $0.39^{circ}C$ after Qigong therapy(p<0.05). 3. The difference of temperature${Delta}T$ between upper(Ex-HN3) and middle Danjon(CV17) decreased about $0.25^{circ}C$ after Qigong therapy, but it was not statistically significant.