decrease in sensitivity can be avoided to obtain a stable and highly sensitized photosensitive layer in a process for preparing a photopolymerizing lithographic plate including a coating step and using rubber rollers before and after the coating site . this is achieved by excluding an antioxidant and / or aging retardant from at least the surface of rubber rollers placed before and after the coating site . the photopolymerizing lithographic plate excellent in its sensitivity as compared with the conventional one can be obtained .