Ceramic　composite　heat　storage　materials　were　prepared　by　mixed　sintering　method　with　binary　carbonates　(Li2CO3-K2CO3,　BC,　62:38,　mole　ratio)　and　ternary　carbonates　(K2CO3-Li2CO3-Na2CO3,　TC,　1:2:1,　mole　ratio)　as　phase　change　materials,　and　with　magnesium　oxide　as　the　matrix　material.　The　melting　point　of　binary　and　ternary　carbonates　composites　(BCC,　TCC)　are　465.1　and　386.4　respectively,　which　is　similar　to　the　corresponding　mixed　carbonates.　Composite　heat　storage　materials　maintain　a　high　specific　heat　value　within　the　highest　using　temperature　(800),　and　the　latent　heat　is　more　than　150　J/g.　Based　on　the　characterization　analysis　of　XRD　and　SEM,　two　kinds　of　composite　heat　storage　materials　have　good　chemical　stability,　and　the　matrix　material　can　well　support　the　phase　change　material.　The　thermal　properties　of　the　composite　heat　storage　materials　don＇t　change　significantly　and　have　good　thermal　cycling　stability　after　50　thermal　cycles.　©　All　Right　Reserved.