To offer a lithographic method possible to conduct an on-press process together with automatic plate loading and on-press exposure in all the lithographic press.

The method consists of six stages: (i) a web of an imaging material including (1) a soft lithographic base material having a hydrophilic surface and (2) an image recording layer removable with a single-fluid ink or with the single-fluid ink by being exposed to heat and light are rewound from a supply spool, (ii) the imaging material is wounded around a cylinder of a printing press, (iii) the image recording layer is exposed to the heat or the light image-wise, (iv) a printing master is obtained by supplying the single- fluid ink and processing the image recording layer, (v) printing is conducted by supplying the single-fluid ink to the printing master installed in a plate cylinder of the printing press, and (vi) the printing master is taken out of the plate cylinder (preferably by winding up with an uptake spool).