Combined with the heat storage temperature control performance of building structure in the field of solar energy,the “two-step method” was applied to prepare a new type of paraffin/carbon nanotube(CNTs) solar heat storage phase change emulsion.The nano particle potentiometer and brooke rotating viscometer were used to study the influence of CNTs content on the technical performance of phase transition emulsion,and determined the optimal amount of CNTs.Moreover,differential scanning calorimetry apparatus,coefficient of thermal conductivity meter,self-control sunlight-thermal conversion device and UV-Vis-NIR spectrophotometer were used to explore the phase change thermal performance and light-heat conversion performance of emulsion.The results shown that as the content of CNTs increased,the particle size distribution and kinematics viscosity of phase change droplets changed significantly.Considering the stability and pumping performance of phase change emulsion,it was recommended that the content of CNTs in paraffin phase change emulsion should be controlled at 0.6%.Due to the high phase change heat storage performance of paraffin and the relatively high thermal conductivity of CNTs,the addition of paraffin/CNTs can significantly enhanced the thermal conductivity and light-heat conversion ability of phase change emulsion,which can be fully used in building structures to achieve thermal storage and temperature regulation of solar radiation.