Considering the excellent adsorptive performance of porous silica,we prepared the polyethylene glycol/silicon dioxide shape-stabilized phase change materials(PEG/SiO2SSPCM)by impregnating different amounts of polyethylene glycol into the pore structure of silicon dioxide gel. And asphalt-shape-stabilized phase change materials blends(Asphalt-SSPCM)with different amounts of polyethylene glycol were prepared by the melt blending method. The pore structure of silicon dioxide and morphology of PEG/SiO2SSPCM were characterized by using porosity analyzing instrument and scanning electron microscope(SEM). The crystal structure,chemical compatibility, heat storage property and heat stability of PEG/SiO2SSPCM in asphalt were studied by X-ray powder diffraction(XRD),Fourier transforming infrared spectrum(FTIR)and synthesized thermal analyzer (DSC/TG). The results showed that silicon dioxide had porous microstructure with high surface area,which can absorb polyethylene glycol. Polyethylene glycol crystals still existed in the Asphalt-SSPCM,and the heat storage ability of the Asphalt-SSPCM increased with increasing the polyethylene glycol amount in the blends. The enthalpy of the blends was 117.5J/g with 76.1% polyethylene glycol,and the blends with different amounts of polyethylene glycol all showed favorable heat stability and cooling effect,but there was only physical interaction between Asphalt-SSPCM. Moreover,the heat storage principle of Asphalt-SSPCM was analyzed based on the phase change theory.