The　polycrystalline　Ca3Co4O9　oxide　powders　were　synthesized　by　citrate　acid　sol-gel　method,　and　the　Ca3Co4O9　oxide　ceramics　with　diverse　grain　alignments　were　prepared　by　sintering　the　pressed　pellet　bulks　through　controlling　the　procedures,　respectively.　The　phase　compositions,　grain　alignments,　bulk　microstructures,　textures　as　well　as　the　electrical　transport　properties　were　investigated　by　means　of　X-ray　diffraction　pattern　XRD,　scanning　electron　microscopy　SEM,　transmission　electron　microscopy　TEM　and　electrical　constant　measurements　apparatus.　The　results　showed　that　the　obtained　Ca3Co4O9　ceramics　with　uniformly　single　phases　and　diverse　grain　alignments　can　be　fabricated　by　modulating　the　preparing　parameters;　moreover,　the　grain　alignment　can　be　enhanced　by　applying　the　pressure　of　the　sintering　procedure.　The　Ca3Co4O9　ceramics　with　uniformly　single　phase　and　strongest　grain　alignment　could　be　fabricated　with　formation　pressure　of　500　MPa　and　sintering　pressure　of　30　MPa.　The　sintering　pressure　is　a　key　factor　enhancing　the　grain　alignment　for　this　type　of　ceramics.　The　ceramic　sample　with　highest　grain　alignment　was　found　to　have　the　highest　electrical　properties,　which　showed　the　maximum　power　factor　value　of　3.83　mu　W　cm(-1)　K-2　at　700　degrees　C.