In order to explore the influence of sensitizer doping on the thermal effect ofup-conversion particles-assisted photopolymerization（UCAP），and to fully utilize the thermal effect to enhance energy utilization and curing rate，a series of NaYF4：Yb³⁺/Tm³⁺ up-conversion particles with different sensitizer doping was prepared. The system temperature wasmonitored using a thermal imager，and real-time infrared spectroscopy was used to characterize the polymerization kinetics. The results showed that with the increase of the sensitizer doping，the thermal effect of UCAP was enhanced. By adding both photoinitiator andthermal initiator into acrylic resin materials，a UCAP-based photothermal synergistic curing system was constructed. Compared to the UCAP system，the polymerization rate of thephotothermal synergistic curing system was significantly improved，and the curing efficiency ofthe prepared near-infrared photothermal co-curing coating materials was also higher，and the required near-infrared radiation dose was reduced by 30%.