The　pass-band　characteristics　of　three-dimensional　photonic　band-gap　(PBG)　structure　with　line　defect　were　investigated　in　this　paper,　which　were　fabricated　with　high-K　TiO2　ceramic　based　on　3D　printing　technique　and　sintering　process.　The　transmission　characteristics　were　measured　using　transmission/reflection　method　and　computed　using　FDTD　method.　Experimental　results　show　that　pass-band　frequency　of　the　waveguide　between　13.5　and　14.7　GHz　is　within　the　band-gap　of　PGB　structure　(12.2-16.4　GHz)　when　the　practical　lattice　constant　of　PBGs　is　11.34　mm　and　practical　aspect　ratio　is　0.296,　and　transmission　efficiency　is　80%,　which　increases　by　60%　than　that　of　low-dielectric　Al2O3　ceramic　with　transmission　efficiency　of　50%.　Moreover,　the　computing　results　basically　agree　with　the　experimental　results.　These　results　indicate　that　waveguide　of　PBG　structure　with　high-K　materials　will　be　able　to　obtain　higher　transmission　efficiency,　which　will　provide　a　method　for　adjusting　transmission　characteristics　of　PBG　structure　and　promote　PBG　structure　into　the　practical　applications.