With the consumption of energy, scholars prepare phase change concrete by adding phase change materials to concrete for phase change heat storage, and in view of some defects and deficiencies of current phase change concrete, decric acid, lauric acid and palmitic acid phase change materials are selected for melting and mixing to prepare ternary composite phase change materials. DSC test was carried out to detect the latent heat and temperature of phase change, the coarse aggregate of phase change concrete was prepared by the method of porous matrix adsorption, and the adsorption of internal phase change material was observed by SEM test. In order to prevent the leakage of the internal phase change material from affecting the strength of the concrete, the cement slurry method and the epoxy resin + cement powder method were selected to encapsulate them respectively, and the phase change cycle test was carried out to determine the leakage rate of the phase change material. The phase change coarse aggregate was mixed into the concrete to prepare the phase change concrete suitable for building energy piles, the compressive performance test and thermal conductivity test of the concrete, and the phase change cycle durability test was carried out at the same time, and finally the packaging method of cement slurry could better meet the needs of the building energy pile to bear the external load and temperature load. The results show that when the content of phase change coarse aggregate is 20%, the compressive strength, thermal conductivity and phase change cycle stability of phase change concrete are better, and the cement slurry encapsulation has less influence on the compressive performance of phase change concrete after phase change cycle than that of epoxy resin + cement powder encapsulation, and the application range is wider.