The　electrical　transport　properties　of　Ca3Co4O9　could　be　in　by　doping　in　the　Ca　site.　The　Ca　site　doped　Ca3-xAgxCo4O9　(x　=　0-0　05)　bulk　samples　were　fabricated　by　citric　acid　sol-gel　and　spark　plasma　sintering　method.　The　resulting　samples　were　analyzed　by　X-ray　power　diffraction,　scanning　electron　microscopy　and　electrical　constant　measurement　The　results　showed　that　all　samples　were　single　phased,　the　prefered　onentation　was　lowered　by　Ag　doping　for　Ca　The　A　(sic)=　0　03　sample　exhibited　highest　grain　orientation　among　doped　samples,　which　exhibited　layered　microstructure.　Its　electrical　resistivity　was　increased　and　then　decreased　slightly　by　Ag　doping,　but　the　transport　mechanism　was　not　changed.　However,　the　doped　samples　exhibited　high　electrical　resistivity　caused　by　changed　electronic　structure　by　Ag　doping　for　Ca　The　x　=　0.04　sample　exhibited　highest　electrical　resistivity　in　the　measuring　temperature　region　with　the　highest　value　14　6　m　Omega.cm　at　973　K.