Phase　change　materials(PCMs)　is　the　basis　of　the　research　of　phase　change　heat　storage　technology.　Aimed　at　the　low　thermal　conductivity　of　common　phase　change　material-paraffin,　nano　particles　addition　technology　was　used　to　enhance　the　heat　transfer　performance　of　paraffin,　so　the　thermal　conductivity　and　thermal　diffusion　coefficient　of　paraffin　were　improved.　Through　melting　test　of　nano　particle-paraffin　and　observation　of　settling　process　of　nano　particles,　Cu　nanoparticle　and　dispersing　agent　Hitenol　BC-10　were　selected　to　prepare　a　kind　of　stable　nano-particle/paraffin　composite　phase　change　storage　material,　and　its　thermal　physical　properties　were　tested.　The　experimental　results　showed　that　addition　of　nano-copper　particles　could　increase　the　thermal　conductivity　of　paraffin　apparently.　Compared　with　the　pure　paraffin,　thermal　conductivity　of　solid　nano-copper/paraffin　increased　by　7.9%,　the　liquid　nano-copper/paraffin　increased　by　3.8%,　while　the　solid　and　liquid　thermal　diffusion　coefficient　increased　by　20.6%　and　16%　respectively.　©　All　Right　Reserved.