A photosensitive lithographic printing plate comprises a photosensitive
layer and a protective layer formed in this order on a support, wherein
the photosensitive layer has a maximum peak of spectral sensitivity
within a wavelength range ranging from 390 to 430 nm, the minimum
exposure for the photosensitive lithographic printing plate for image
formation at a wavelength of 410 nm (S410) is at most 100 .mu.J/cm.sup.2,
and the relation between the minimum exposure for image formation at a
wavelength of 450 nm (S450) and the minimum exposure for image formation
at a wavelength of 410 nm (S410) is 0