Vat　photopolymerized　3D　printing　technology　can　be　used　to　fabricate　ceramics　with　complex　shapes.　However,　the　extensive　use　of　photosensitive　resins　as　binders　is　not　conducive　to　achieving　crack-free　ceramic　green　parts,　especially　the　Si3N4　ceramics　with　the　weak　interlayer　bonding.　In　this　work,　the　influence　of　different　debinding　atmosphere　on　the　pyrolysis　process　of　organics　in　vat　photopolymerization　3D　printed　Si3N4　green　parts　was　investigated.　The　results　showed　that　the　use　of　95　vol%　N2+5　vol%　H2　atmosphere　can　effectively　inhibit　the　cracking　during　the　debinding　process,　especially　the　wall　thickness　of　the　3D　printed　defect-free　Si3N4　green　body　was　successfully　increased　to　5　mm,　and　the　obtained　sintered　Si3N4　ceramics　exhibited　higher　true　densities　and　better　mechanical　properties.　The　debinding　atmospheres　proposed　in　the　current　work　provided　additional　options　of　debinding　atmosphere　for　achieving　high-performance　3D　printed　Si3N4　ceramics　and　are　expected　to　be　expanded　to　other　photosensitive　slurry　systems,　with　the　potential　to　enable　the　production　of　ceramic　components　with　the　larger　wall　thicknesses.　©　2024