Using the porous graphite as an inorganic carrier, through the physical adsorption in high temperature, two fatty acids, lauric acid and myristic acid, were adsorbed into porous graphite. According to the temperature sensibility and long term stability detected by hot and cold durability test, the proper firing technology, the adsorption content of fatty acids, and the adsorption temperature were determined. The results show that when the firing temperature is 800℃, the porous graphite can adsorb 700%(by mass) fatty acids phase change materials into the internal pores under 70℃ water bath.This kind of composite phase change product achieves less than 3% mass loss after thermal cooling cycling. The phase transformation point is not changed and the loss of enthalpy of transformation is 1014% after being immersed into alkaline environment.