Many technical methods to realize the development free CTP have been proposed, are able to be classified to three technical categories. That is, additive technique like transferring method or ink-jet method, formation or morphology changing technique like ablation method or surface roughness changing method and phase changing technique. On this paper, the phase changeable CTP technology is mainly reviewed on the basis of patent literature. The key technical point is how to design the mechanism to change hydrophilic phase to lipophilic phase, or the opposite, after laser imaging and to develop the most suitable materials to realize the designed mechanism. Two methods expected to be practical which are chemical composition changing and chemical functional group or chemicals changing are detailed. The development free CTP has been asked as the ideal plate in the future for a long time, now it is strongly demanded for the plate on CTPress system.
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