Recently much attention has been paid to the electro-optic modulators with reflection geometry. A new type of electro- optic modulator, which consists of prism-metal-polymer-buffer- metal geometry and works based on Attenuated Total Reflection spectrum, has been developed in our group. In this paper, we propose a double-channel electro-optic polymer modulator, in which two pairs of electrodes are fabricated in ATR configuration. When two light beams are arranged to incident at the prism base with an appropriate angle corresponding to a special mode of the polymer waveguide. The intensity of the two reflected light beams can be directly modulated by the applied voltages due to Pockels effect of the poled-polymer film simultaneously. In the case of applying two different electrical signals to the two different pairs of electrodes, double-channel polymer modulator carrying different information can be fulfilled in a single-prism configuration.