In view of some problems of the thermal cross-linking CTP plate previously prepared in our laboratory, an acid proliferation generator was synthesized and used in the preparation of CTP plate. Therefore, the sensitivity and imaging quality of CTP plate was improved obviously. This kind of plate has an imaging layer, comprising an admixture of a resole resin, a novolac resin, a latent Bronsted acid, an acid proliferation generator, an infrared absorber and colorant. The plate is intended for digital exposure with an infrared laser with 830nm in a computer to plate (CTP) machine. The dot density of the printing plate ranges from 1 to 99 percent, and the resolution can reach 6μm. On the aspect of making printing plate these characteristics achieve acceptable criterion of printing.