Sn-Zn alloy with low melt point was prepared by casting technology.The structure and heat storage properties were investigated by optical microscope（OM）

XRD（X-ray diffraction）

DSC and laser thermal constants measuring apparatus.The results show that the latent heat of the alloy and phase-change temperature

thermal conductivity are 198.1 ℃

65.8 J/g and 53.4 W/（m·K）

respectively.The phase change temperature is increased slightly and latent heat and thermal conductivity are decreased gradually with the increase of thermal cycling.The change rate of phase change temperature

thermal conductivity and latent heat of the alloy is below 5% after 500 heat cycles。