In order to predict the spectral reflectance of rectoverso halftone images, the scattering of light within paper and the ink penetration in the substrate are considered and the color spectral reflectance precise prediction model for rectoverso halftone images is proposed. Based on the assumption that ink is a nonscattering medium, paper is a strong scattering substrate,both of which have the same refractive index, the WilliamsClapper model is proposed.The inkspreading model includes nominaltoeffective dot area coverage functions for each of the different ink overprint conditions by the least square curve fitting method and the network structure of multiple reflection. It turned out that the modeled and the measured colors agree very well, confirming the validity of the used model. The new model provides a theoretical foundation for color prediction analysis of rectoverso halftone images and the development of prints quality detection system.