Disclosed is an inkjet image forming method using active energy ray curable ink which has excellent printing durability, gloss uniformity on coated paper, and suitability for paper feeding, and which resists being transferred to the reverse side when printed pages are stored in a stack where the printed sections come into contact with another printed page; also disclosed is an inkjet ink set. The inkjet image forming method is characterized by applying to a base material, then heating, a colorless ink not containing a colorant but containing an active energy ray curable composition and a gelling agent which forms a thermoreversible gel, and thereafter irradiating said colorless ink with active energy rays.