This study investigates the properties of flame-retardant vinyl ester resins for vacuum-assisted resin infusion（VARI）processes，providing data support for the application of resins.Characterization methods including viscometer，differential scanning calorimeter（DSC），dynamic mechanical analyzer（DMA），oxygen index tester，and universal testing machine were employed to evaluate the resin system''s process adaptability，heat resistance，flame retardancy，and the mechanical properties of both the resin and its composites.The results show that the gel time at 20-30 ℃ exceeds 30 min，and the viscosity at 25 ℃ remains around 400 mPa·s for extended periods，indicating good processability.Curing-kinetics analysis yields the gelation，cure，and post-cure temperatures of the system.The resin exhibits excellent thermal and flame-retardant performance：the heat deflection temperature reaches 114.3 ℃，the glass-transition temperature reaches 134 ℃，and the limiting oxygen index exceeds 27%， meeting the criterion for"hardly combustible"materials.The neat-resin casting and its composites show outstanding mechanical properties；the flexural strength of the casting reaches 156 MPa.Overall，the resin demonstrates superior performance and provides a solid basis for subsequent application-oriented research.