3D　printed　cement-based　materials　decreases　interstrip　contact　surface　properties　due　to　the　stack　molding　process.　Metakaolin　can　reduce　porosity　and　improve　mechanical　property,　but　its　high　water　demand　cause　water　loss　on　the　surface　of　printing　strip,　and　the　interlayer　bonding　performance　decline.　Limestone　powder　has　a　dilution　effect,　which　can　improve　the　high　water　demand　of　metakaolin.　The　influences　of　metakaolin　and　mixed　limestone　powder　on　anisotropic　performance　of　3D　printed　cement-based　materials　were　studied,　and　the　mechanism　from　a　microscopic　perspective　was　explained.　The　results　show　that　the　optimal　mass　content　of　metakaolin　is　12%,　and　the　optimal　mixing　mass　ratio　is　m(metakaolin)　∶　m(limestone　powder)　is　2　∶　1.　After　adding　metakaolin,　the　fluidity　of　3D　printed　cement-based　materials　decreases　significantly,　the　fluidity　of　mixed　limestone　powder　increases.　The　compressive　strength　of　3D　printed　test　block　is　characterized　by　X　＞　Z　＞　Y　＞　molding,　and　the　variation　pattern　of　flexural　strength　in　different　directions　is　basically　the　same　as　the　compressive　strength,　with　anisotropic　characteristics.　©　2024　Bulletin　of　the　Chinese　Ceramic　Society　Press.　All　rights　reserved.