Based on the hot pressing method,the refraction layer was achieved by adding TiO _2particles into AB blend with a certain ratio.The refraction layer was added the chip and the phosphor layer by spin coating,and then they were packaged into white light digital tube.Photo-chromic properties of the samples were tested and analyzed.The white light digital tube can reach the maximu m luminous flux of 175lm when the TiO_{2concentration} is 0.3% in the refractio n layer,which is enhanced by approximately 7.5% compared with that when TiO_{2concentration} is 0.Under the same testing conditions,the inverted white light digital tube with 0.3% concentration of TiO_2increased about 6.5% luminous flux increase compared with traditional ones,the average color temperature declines by about 9.6%,and the light is more ideal.The adding of TiO _2particles not only improves the luminous flux of white light digital tube and reduces the color temperature,but also provides a valid way for achieving remote phosphor film coating process for white light digital tube.