Abstract: High refractive UV curing prepolymer was synthesised by using 2, 5-dimercapto thiamethoxam- diazole,3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate(IPDI),tetrabutyl titanate(HEMA) as the main raw material. Using 2-hydroxyethyl methacrylate(TBT) as precursor, KH570 as modifier, the uniform and stable TiO2 sol was prepared via sol gel method. Based on UV curing, high refractive UV curing prepolymer was hybridized with TiO2 sol and high refractive composite materials modified by doping TiO2 sol were prepared.The performance of high refractive UV curing prepolymer, TiO2 sol and high refractive composite materials modified by doping TiO2 sol were characterized by FT-IR, TG, Abbe Refractometer, UV-Vis Spectrophotometer, Nano Particle Size Analyzer, XRD and SEM. Results show that by means of UV curing, TiO2 sol can disperse comparatively in the UV curing prepolymer and high refractive composite materials modified by doping TiO2 sol can be prepared. With the increasing of doping TiO2 sol, the cracking temperature, hardness and impact strength of high refractive composite materials modified by doping TiO2 sol are improved. When the mass fraction of doping TiO2 sol is 1.25%, the refractive index of composite materials modified by doping TiO2 sol is as high as 1.841.