The work aims to achieve the characterization of color spectrum to the device-related color space. RBF network and cube class subdivision were combined to construct a model for LCD display color spectrum to be converted into RGB numerical values. Based on objective verification, the average color difference of 343 reversely converted color spectra was 0.61 and the maximum color difference was 2.62. In conclusion, the proposed model is a model of higher precision and reverse characterization.