It is very difficult to measure human metabolism ability directly. According to thermoregulation system, inner metabolic information could be send to outer to induce the temperature of the skin surface to change. The change includes metabolic heat-generation and heat-transfer of blood perfusion. Based on infrared thermograph this paper analyzes temperature curves of different population, using Independent Component Analysis(ICA) to improve identification of the body metabolic characteristics. We access to the numerical assessment of metabolic parameters.