In an image forming method of wet fixing system, the fixing solution contains an ester compound represented by at least one of general formula (1) and general formula (2) below:
R11—(CO)—O—R12 General formula (1):
where R11 represents a linear or branched alkyl group having at least one hydroxyl group and 2 to 11 carbon atoms, and R12 represents a linear or branched alkyl group having 1 to 4 carbon atoms;
R21—O—(CO)—R22—(CO)—O—R23 General formula (2):
where R21 represents a linear or branched aliphatic hydrocarbon group having 1 to 4 carbon atoms, R22 represents a linear or branched aliphatic hydrocarbon group having at least one hydroxyl group and 1 to 8 carbon atoms, and R23 represents a linear or branched aliphatic hydrocarbon group having 1 to 4 carbon atoms.