This　paper　proposed　a　method　for　preparing　subtle　and　complex　lattice　structure　Al2O3　ceramic　via　digital　light　processing　(DLP)　3D　printing　technology.　The　solid-phase　mass　fraction　of　Al2O3　ceramic　slurry　and　the　porosity　of　the　green　body　reached　52%　and　83%,　respectively.　According　to　the　TG-DSC　curve　and　two-way　analysis　of　variance,　the　optimum　technological　parameters　for　debinding　and　sintering　of　Al2O3　ceramic　green　body　were　determined.　The　same　shrinkage　of　Al2O3　ceramic　prepared　by　pressureless　sintering　in　all　directions　was　confirmed.　The　density　of　sintered　lattice　structure　Al2O3　ceramic　was　95%,　and　the　diameter　of　the　lattice　structure　strut　was　about　170　mu　m.　XRD　and　Raman　spectrum　showed　that　the　crystal　phase　of　the　sintered　Al2O3　ceramic　was　alpha-phase,　which　has　a　good　crystal　quality.　SEM　results　revealed　a　high　density　without　significant　pores　and　cracks　sintered　ceramic.　The　strict　complex　structure　Al2O3　ceramic　prepared　by　DLP　technology　had　a　compact　microstructure　and　similar　to　the　mechanical　strength　of　Al2O3　prepared　via　the　conventional　shaping　method,　thereby　providing　an　effective　method　for　fabricating　large　specific　surface　area　ceramic　radiators　and　fine　ceramic　components　in　other　fields.