The　filled　skutterudite　compounds　REy(Fe/Ni)xCo4-xSb12　(x=0-1.0,　y=0-0.4)　were　synthesized　by　solid　state　reaction　and　Spark　Plasma　Sintering　(SPS)　at　800-1000　K　using　the　powders　of　Co,　Sb,　Fe,　Ni　and　rare　earth　Ce　and　La　as　precursors.　The　effects　of　the　kinds　of　filling　and　replacement　atoms　and　the　form　of　filling　on　the　lattice　thermal　conductivity　and　thermo-electric　property　were　discussed　in　this　paper.　The　results　indicate　that　the　thermoconductivity　is　remarkably　reduced　by　substituting　Co　with　Ni　and　Fe,　and　Ni　has　a　better　effect　on　thermoconductivity　in　contrast　with　Fe.　In　addition,　the　lattice　thermal　conductivity　is　obviously　decreased　by　filling　with　rare　earth　Ce　and　La　into　the　Skutterudite　structure.　The　decrease　of　lattice　thermal　conductivity　is　more　effective　by　double　fillings　of　Ce　and　La　than　single　filling　for　the　same　filling　fraction.　The　electric　conductivity　is　decreasing　and　the　Seebeck　coefficient　is　increasing　with　the　filling　fraction　of　Ce　and　La　increasing.　The　Skutterudite　compound　Ce0.1La0.2FeCo3Sb12　possesses　the　minimum　thermal　conductivity　and　the　highest　Seebeck　coefficient　with　the　highest　ZT　value　of　0.6　at　800　K.