Abstract: Two kinds of solid-solid phase change materials, which are organoammonium metallic compounds and polyalcohol compounds (plastic crystals), arestudied. Epoxy resin and silicon rubber are adopted to blend with solid-solid phasechange materials in casting. Their thermal properties are characterized by differentialscanning calorimetry (DSC) and the results show that some solid-solid phase changematerial systems with phase transition temperature range of 30-40℃, transition enthalpy about 100J/g have been obtained. The application prospects for energy resources, spacecraft, agriculture, constructions, chemical industry and metallurgyetc. have been discussed.