［Objective］ In order to enhance the cross-linking density of light-curing acrylateresins and optimize their thermal stability，mechanical properties，and water resistance，a research study was conducted.［Methods］In this paper，epoxy acrylate prepolymers were synthesized usingglycidyl acrylate（GMA），methyl methacrylate（MMA），and butyl acrylate（BA） as raw materials. Subsequently，UV-curable unsaturated acrylate prepolymers（UEA1-UEA3） were prepared usingepoxy acrylate prepolymer precursors and acrylic acid（AA）as raw materials，and the correspondingcured films were prepared. The cured films were characterized by FT-IR， ¹H MNR，DTG，DSC，DMA， and the cured films were tested for water absorption，water contact angle，and tensile properties.［Results］The results demonstrated the successful preparation of epoxy acrylate prepolymer andunsaturated acrylate prepolymer. The enhancement of crosslink density in UEA，attributable to the increase of GMA dosage and the introduction of unsaturated bonds，directly augmented the tensilestrength of the cured films without compromising their elongation at break. With the rise in crosslink density，a substantial enhancement in glass transition temperature was observed for the cured films.Furthermore，an upward trend was evident in the thermal decomposition temperature of the cured films.The thermal decomposition temperature of the cured film exhibited an upward trend，and the increase in crosslink density of the cured film significantly enhanced its surface hydrophobicity. When the massfraction of GMA was 29. 29%，UEA2 exhibited optimal comprehensive performance，circumvented the low-temperature decomposition caused by excessive cross-linking and internal defects，and possessed a stable cross-linking structure. The water contact angle was 82°，the water absorption rate was 1. 04%， the elongation at break was 6. 36%，the T5% was 265. 83 ℃，and the tensile strength reached 17. 37 MPa.［Conclusion］The crosslink density of the cured film，as a major factor affecting mechanical properties and thermal stability，can be controlled in this synthesis pathway.