Gravure plate making method

The present invention relates to an intaglio plate-making method, which can perform excellent intaglio plate-making without heating after coating film formation by using a positive thermal resist. Coating a positive photosensitive agent on a plate-making roller to form a photosensitive film, wherein the photosensitive agent is composed of an alkali-soluble positive photosensitive composition which has development latitude without heating after film formation and is sensitive to laser in an infrared wavelength region; Then, the positive image is exposed to the photosensitive film by laser in the infrared wavelength region, and the main chain and side chain of the photosensitive film-forming resin molecules are cut off at the exposed part to form low molecules that further improve the alkali solubility, and at the same time, the photosensitive layer is properly scattered.