Spectral characteristics of the displayed color of the mobile terminal were analyzed in different environments, to study the influence of ambient environment on the LCD display of the mobile terminal. The spectral radiance curves of the displayed colors of the mobile terminal LCD display were measured in darkroom and under D50 illuminant, respectively. The spectral superposition model between displayed color and the three primary colors was improved based on Gauss - Markov linear regression. Then a conversion model of display color spectral radiance under two different environmental conditions was established on the basis of the linear superposition of color spectral radiance functions. The results showed that the ambient environment had an obvious influence on the spectral radiance of the same displayed color, but there was no influence on the independence of the channels. In both environments, the mobile terminal had good channel independence. The spectral mean square error and CIEDE2000 color difference between the model predicted values and measured values showed that the spectral radiance calculation accuracy of the improved linear superposition model was enhanced by 6 folds as compared to that of the original model, and the mean color difference was reduced to less than 0.1 NBS. The predicted values of the spectral model and the measured values of the same displayed color were very close in the two different environments, with a mean color difference of less than 1 NBS. The improved spectral superposition model quantified the color display characteristics of the mobile terminal more accurately, and the establishment of the spectral transfer model could effectively remove the influence of ambient environment on the color display of the mobile terminal, which provided method for the enhancement of image display of the mobile terminal.