A process for producing a lithographic printing plate comprising: (i) image-wise exposing a lithographic printing plate precursor comprising at least a photosensitive layer on a support; and (ii) removing unexposed areas of the photosensitive layer in the presence of an aqueous developer having a pH of from 2 to 10 and which contains a water soluble polymer compound and a surfactant selected from a nonionic surfactant, an amphoteric surfactant and a combination thereof to carry out development and gumming at the same time; wherein the photosensitive layer of the lithographic printing plate precursor comprises the following components,, and: a copolymer having a repeating unit represented by the formula, a repeating unit represented by the formula and at least either one of a repeating unit represented by the formula and a repeating unit represented by the formula: in the formulae,,, and, R represents an acyl group having from 2 to 20 carbon atoms, an alkyl group having from 1 to 20 carbon atoms, an aryl group having from 6 to 20 carbon atoms, an alkenyl group having from 2 to 20 carbon atoms, or an alkynyl group having from 2 to 20 carbon atoms; R 1 to R 9 are each independently a hydrogen atom or an alkyl group having from 1 to 20 carbon atoms; R 10 represents a hydrogen atom, a methyl group, an ethyl group, a propyl group, a phenyl group or a hydroxyphenyl group, with the proviso that any two of R 1 to R 3 in formula may be the same or different; L represents a divalent linking group containing alkylene, arylene, alkenylene,-SO 2 -, -SO-, -O-, -S-, -CO-, -N(R 3a)-, either singly or in combination, wherein R 3a represents an alkyl group, an aryl group or a hydrogen atom; X represents a carboxylic acid group or a carboxylate salt; L 0 represents a single bond or a divalent hydrocarbon group having from 1 to 6 carbon atoms, with the proviso that R 2 and R in the formula, R 5 and L in the formula, and R 8 and L 0 in the formula may be coupled to each other to form a ring; a compound having an ethylenically unsaturated bond; and a polymerization initiator. (i) image-wise exposing a lithographic printing plate precursor comprising at least a photosensitive layer on a support; and (ii) removing unexposed areas of the photosensitive layer in the presence of an aqueous developer having a pH of from 2 to 10 and which contains a water soluble polymer compound and a surfactant selected from a nonionic surfactant, an amphoteric surfactant and a combination thereof to carry out development and gumming at the same time; a copolymer having a repeating unit represented by the formula, a repeating unit represented by the formula and at least either one of a repeating unit represented by the formula and a repeating unit represented by the formula: in the formulae,,, and, R represents an acyl group having from 2 to 20 carbon atoms, an alkyl group having from 1 to 20 carbon atoms, an aryl group having from 6 to 20 carbon atoms, an alkenyl group having from 2 to 20 carbon atoms, or an alkynyl group having from 2 to 20 carbon atoms; R 1 to R 9 are each independently a hydrogen atom or an alkyl group having from 1 to 20 carbon atoms; R 10 represents a hydrogen atom, a methyl group, an ethyl group, a propyl group, a phenyl group or a hydroxyphenyl group, with the proviso that any two of R 1 to R 3 in formula may be the same or different; L represents a divalent linking group containing alkylene, arylene, alkenylene,-SO 2 -, -SO-, -O-, -S-, -CO-, -N(R 3a)-, either singly or in combination, wherein R 3a represents an alkyl group, an aryl group or a hydrogen atom; X represents a carboxylic acid group or a carboxylate salt; L 0 represents a single bond or a divalent hydrocarbon group having from 1 to 6 carbon atoms, with the proviso that R 2 and R in the formula, R 5 and L in the formula, and R 8 and L 0 in the formula may be coupled to each other to form a ring; a compound having an ethylenically unsaturated bond; and a polymerization initiator.