Abstract：Objective：To observe the characteristics of whole-body infrared thermal image in patients with yang-deficiency constitution，and to objectively evaluate the clinical effect of fire dragon moxibustion at governor vessel on improving yang- deficiency constitution by infrared thermal imaging technology. Methods： A total of 60 cases of subjects with yang- deficiency constitution and 30 cases of healthy volunteers with moderate constitution were recruited. According to the random number table method， 60 cases of subjects with yang- deficiency constitution were divided into the warming moxibustion group and the fire dragon moxibustion at governor vessel group， with 30 cases in each group. The warming moxibustion group was treated with warming moxibustion， and the fire dragon moxibustion at governor vessel group was treated with fire dragon moxibustion. Both groups were treated for consecutive eight weeks. Before and after treatment， both groups were scored with constitution scale and examined with infrared thermal imaging；the clinical effects were observed；the differences in characteristics of infrared thermal image were compared and analyzed. Results： The number of patients with yang- deficiency constitution whose thermal value of body surface in abdomen and knee and thermal image of governor vessel showed continuity was smaller than that of healthy volunteers with moderate constitution， the difference being significant(P＜0.05). After treatment， the transformation scores of yang- deficiency constitution in the two groups were decreased when compared with those before treatment(P＜0.05)；the transformation score and differential value of yang-deficiency constitution in the fire dragon moxibustion at governor vessel group were better than those in the warming moxibustion group， the difference being significant(P＜0.05). After treatment，the thermal values of body surface in abdomen and knee in the two groups were increased when compared with those before treatment，and the number of patients whose thermal image of governor vessel showed continuity was bigger than that before treatment，the difference being significant(P＜0.05). After treatment，the thermal value of body surface in abdomen and knee in the fire dragon moxibustion at governor vessel group was higher than that in the warming moxibustion group， and the number of patients whose thermal image of governor vessel showed continuity was big， the difference being significant(P＜0.05). Conclusion： Infrared thermal imaging can objectively reflect the characteristics and changes of thermal values of body surface in patients with yang- deficiency syndrome. When compared with the traditional warming moxibustion，fire dragon moxibustion at governor vessel has a significant curative effect on improving the clinical symptoms and thermal value of body surface in patients with yang-deficiency syndrome.