The color prediction law of fluorescent ink half tone is a pivotal problem in the region of color imaging processing. The reflective law of color fluorescent ink half tone is generalized by utilizing the idea that the reflected light by fluorescent print is divided into two parts: primary streams which consist of originally incident light and fluorescent streams which are created by absorption of the primary stream. And an exponential matrix modelizing the layer of fluorescent ink is utilized to compute the energy of fluorescence. The weighted factor is introduced to describe the phenomenon that the proportion is different between the exit light from the same colorant and from whole surface by taking into account the fact that proportionally more incident light through a given colorant surface is reflected back onto the same colorant surface than onto other colorant surfaces. And an improved spectral reflection Clapper-Yule model is presented for the fluorescent ink halftone.