The infrared radiant of human meridians and acupoints and its time correlation without any disturbance from outside source were investigated by using infrared thermal imaging technology. The results show that the infrared radiant course exists along meridian over human body, and its radiant intensity has time rhythms. Analyzing the temperature distribution of acupoint versus non -acupoint, we find that the heat transfer of acupoint is preferential meridian direction, while non - acupont is nearly isotropic. These facts confirm the objective existence of human meridian acupoints.