A　supercritical　CO2　(sCO(2))　Brayton　cycle　solar　power　system　based　on　solid　particle　thermal　energy　storage　is　proposed　to　enhance　the　efficiency　of　concentrated　solar　power　(CSP).　The　effective　thermal　conductivity　and　thermal　cycling　stability　of　solid　particles　are　crucial　for　sCO(2)　CSP　applications.　Some　natural　and　artificial　solid　particles,　such　as　black　silicon　carbide,　green　silicon　carbide,　white　corundum,　brown　corundum,　brown　ceramsite　sand,　garnet,　river　sand　and　desert　sand　are　considered　as　potential　thermal　energy　storage　medium　due　to　its　low　cost　and　easy　availability　in　large　quantities.　However,　there　are　few　studies　about　the　effective　thermal　conductivity　and　stability　of　these　solid　particles　after　thermal　cycling　tests.　In　this　study,　the　effective　thermal　conductivity　of　these　solid　particles　was　measured　by　the　hot　wire　method.　Particularly,　the　effective　thermal　conductivity　of　black　silicon　carbide　and　green　silicon　carbide　was　measured　by　modified　hot　wire　method.　In　addition,　the　changes　of　mass,　real　density,　bulk　density,　void　fraction　and　mean　diameter　of　the　above-mentioned　solid　particles　after　100　times　thermal　cycling　tests　were　also　recorded　to　analyze　thermal　cycling　stability.　Based　on　the　results　of　all　the　above　tests,　green　silicon　carbide　exhibits　high　effective　thermal　conductivity　and　good　thermal　cycling　stability,　which　presents　a　great　potential　as　a　thermal　energy　storage　medium.