Developing solution for lithographic printing plate precursor and method for preparing lithographic printing plate

A method for preparing a lithographic printing plate comprising the steps of:

• light-exposing to infrared radiation, an infrared radiation-presensitized plate for use in making a lithographic printing plate, said presensitized plate having an image recording layer which comprise an IR-absorbing dye, and developing the light-exposed plate with an alkaline developing solution comprising a polyoxyalkylene adduct of alkylene diamine, and at least one selected from the group consisting of anionic sufactants represented by the following formulas (II), (III), (IV) and (V), and amphoteric surfactants represented by the formulas (VI), (VII) and (VIII),
• wherein R1 and R2 independently represent hydrogen atom or an alkyl group which may be in the form of linear or branched chain, X and Y independently represent a single bond or a formula:
• —O—(CH2CH2O)n— (n is an integer of from 1 to 100), and M represents a monovalent alkali metal,
• wherein, R represents hydrogen atom or an alkyl group which may be in the form of linear or branched chain, X represents a single bond or a formula:
• —O—(CH2CH2O)n— (n is an integer of from 1 to 100), and M represents a monovalent alkali metal,
• wherein, X and Y independently represent a single bond or a formula:
• —O—(CH2CH2O)n—(n is an integer of from 1 to 100), and M represents a monovalent alkali metal,
• wherein each R3 and R4 represents a hydrocarbon group having carbon atoms of from 2 to 30, and each R′, R″ and R′″ represents a hydrogen atom or a monovalent alkali metal, and each m, n and p represents an integer of from 1 to 10,
• wherein R5, R6 and R7 independently represent a hydrocarbon group having carbon atoms of from 1 to 30, and q represents an integer of from 1 to 10.