The feature of skin microcirculation and a certain channel of thermal transfer in the deep tissue underneath the meridian course are the main factor for the formation of infrared radiant track along meridian course (IRRTM), while the latter what is more important. The channel of thermal transfer in question, which includes a definite depth, form deep to superficial, consists of a several known tissues and some unknown factors may also be involved. P O 2 and tissue temperature are higher, microcirculation abundant and energy metabolism are active to provide a favorable condition for realization of transformation and transmission for material, energy and signal, in this way, meridian is to be able to play an important role in regulation of functional activity of human body.