The effect of monofunctional monomers on the rheological and photosensitive properties of resin-based Al₂O₃ slurry was studied from the perspective of molecular structure and functional groups. The bifunctional group monomer 1,6-hexanediol diacrylate (HDDA) and triple functional group monomer trimethylolpropane triacrylate (TMPTA) were used as raw materials, adding monofunctional monomers X with a selected volume ratio of V_HDDA:V_X:V_TMPTA=6:3:1. The photosensitive resin was fabricated by magnetically stirring at room temperature (RT), and the rheological properties of monofunctional monomers X and resins were studied. The resin-based alumina slurries with solid content of 30vol%~50vol% were prepared by ball milling, the 3D printing process based on stereolithography (SL) was realized and the alumina bodies were fabricated. The monofunctional monomers acryloylmorpholin (ACMO), 2-phenoxyethyl acrylate (2-PHEA), and hydroxyethyl acrylate (HEA) with hydrophilic groups and high photopolymerization activity were used, and the resins with high activity and photopolymerization accuracy were fabricated, benefiting for fabricating Al₂O₃ slurries with superior rheological and photosensitive properties.