Abstract：Moxibustion can induce pathogen to move externally，induce heat to move externally and downward，expel stasis and relieve pain. It is a common external therapy by means of its medicinal effect and warming stimulation，to soothe qi and blood and to achieve the purpose of strengthening the healthy qi and removing pathogenic factors. Based on the syndrome differentiation of eight principles of Chinese medicine， this paper analyzes the mechanism of moxibustion in athletes with lumbar muscle strain with heat syndrome.