The surface of the flip chip was coated with an extraction layer doped with nanoparticles by hot solution method， and the phosphor layer was coated on extraction layer to prepare the white LED module.The photochromatic properties of the samples were measured and analyzed by means of instruments.The experimental results showed that when the particle size of TiO₂ doped particles increased from 16 nm to 46 nm， the optical efficiency amplitude of the module increased by 0.75%， the color temperature increased by 0.57%， and the color temperature uniformity of spatial angle increased from 0.869 3 to 0.87.By adjusting the doping concentration of TiO₂ particles， it was found that the average color temperature of the module could rise first and then fell， and the distribution showed a trend of low edge and high middle. When the doping concentration was 0.8%， the optical efficiency of the module increased by about 5.75% and the average color temperature increased by 9.17%.The results showed that under the condition of Rayleigh scattering， the particle size had no obvious effect on the optical performance of the module. By doping a certain proportion of TiO₂ nanoparticles in the optical extraction layer， the light output efficiency of the white LED module could be improved， and the spatial color temperature uniformity of the module could be effectively improved.