The high temperature fixation system is used to prepare the mixture of the fluorescent powder in different concentrations with the using of yellow fluorescent powder and organic silicone as raw materials.Hot pressing method was applied to a certain quality than mixed with AB mixed gel pr eparation of ZnO particles into refraction protection layer,middle in inversion are blue chip surface spray coated with sling plastic spin craft refraction colloid,silk screen printing method is used to mix fluorescent powder slurry spin around in refractor preparation into white light digital tube,and the samples are light color performance test and mechanism analysis.The research results show that,the color coordinate difference of white light digital tube color is decreasing first and then rising with the increase of phosphor concentration.When the phosphor concentration was 1.19%,the color temperature in the digital tube dropped to the lowest value of 4761.13K,and the color coordinate difference reached the minimum value of 3.5SDCM.With the increase of printing times,the discretization of color coordinates was improved first and then increased.When the thickness of phosphor film was 41μm,the color coordinate difference reached the minimum value of 2.5SDCM. Results the reasonable doping concentration of phosphor particles and the relative thickness of phosphor layer on the gradient refraction structure had significant effect on the spatial colo r uniformity.