The　Ba　and　Ag　co-doped　BaxAgyCa2.8Co4O9　thermoelectric　bulk　materials　are　fabricated　by　acid　sol-gel　and　spark　plasma　sintering　method.　The　phase　compositions,　microstructures　and　thermal　transport　properties　of　the　resulting　bulk　materials　are　analyzed　by　X-ray　diffraction,　scanning　electron　microscopy　and　the　thermal　transport　constant　measurement　apparatus.　The　results　show　that　the　thermal　conduction　behavior　for　the　titled　system　can　be　effectively　tuned　by　Ba　and　Ag　co-doping,　and　the　thermal　conductivity　could　be　reduced　by　increasing　the　Ba　doping　content.　The　analysis　results　show　that　the　total　thermal　conduction　suppressing　comes　from　the　lattice　thermal　conduction　confinement.　The　Ba(0.1)Ago(0.1)Ca(2.8)Co(4)O(9)　bulk　material　is　found　to　have　the　lowest　thermal　conductivity　with　total　thermal　conductivity　and　lattice　thermal　conductivity　reaching　1.43　W/mK　and　1.10　W/mK　at　973　K,　respectively.