Method of producing directly imageable waterless planographic printing plate

A method of producing a directly imageable waterless planographic printing plate, which has at least a heat sensitive layer and an ink repellent layer in this order on a substrate, comprising:

• imagewisely irradiating a precursor of the printing plate with a laser beam,
• pre-treating the precursor by a pre-treatment liquid containing a glycol compound and/or a glycol ether compound represented by the following general formula (I), and
• removing the ink repellent layer at the laser beam irradiated area, in this order,
• wherein the heat sensitive layer is at least partially left on the printing plate after completion of the above steps,
• wherein the heat sensitive layer comprises a light-heat converting substance, a metal-containing organic compound and an active hydrogen-containing compound and
• wherein the general formula (I) is the following:
• R2O(—CHR1—CH2O)n—R3 (I)
• wherein R1 denotes a hydrogen atom or alkyl group with 1 to 5 carbon atoms;
• R2 and R3 denote, respectively independently, a hydrogen atom or alkyl group with 1 to 15 carbon atoms;
• and n denotes an integer of 1 to 12.