The present invention relates to a presensitized plate useful for making a
lithographic printing plate comprising an intermediate layer and a
photopolymerizable photosensitive layer on an aluminum substrate in this
order, wherein the roughness of a surface of said aluminum substrate (Ra)
is in the range of 0.2 to 0.55 .mu.m and the intermediate layer comprises
a polymer compound comprising at least one monomer unit having a sulfonic
acid group and a method for making a lithographic printing plate by
imagewise exposing the presensitized plate described above and developing
the imagewise exposed presensitized plate with a developer comprising an
inorganic alkali salt and a nonionic surfactant comprising a
polyoxyalkylene ether group. The presensitized plate or the method of the
present invention provides a lithographic printing plate showing good
contrast between an image area and non-image area, no background
contamination during printing, good stability with time and good printing
durability.
