A negative-working CTP plate which is superior in resolution and printing
resistance of the image area of a press plate is provided, which is
obtained by forming a latent image on a heat-sensitive layer in a
heat-sensitive lithographic printing plate comprising a substrate having
a hydrophilic surface and a heat-sensitive layer made of an
alkali-soluble polymer formed on the surface of the substrate, using heat
generated upon irradiation with laser light, and developing the
heat-sensitive layer using an alkaline developing solution. In the
heat-sensitive lithographic printing plate comprising a substrate having
a hydrophilic surface, and a heat-sensitive layer made of an
alkali-soluble polymer formed on the surface of the substrate, an
advancing contact angle (.theta..sup.f1) of the surface of the
heat-sensitive layer with water at 25.degree. C. is within a range from
70.degree. to 110.degree., a receding contact angle (.theta..sup.b2) of
the surface of the heat-sensitive layer with water at 25.degree. C. after
heating at 150.degree. C. for 3 minutes is larger than a receding contact
angle (.theta..sup.b1) of the surface of the heat-sensitive layer with
water at 25.degree. C. before heating, and a difference in receding
contact angle before and after heating, (.theta..sup.b2-.theta..sup.b1),
is larger than 1.degree. and is smaller than 40.degree..