Disclosed is an image forming process having the steps of exposing by an exposure device a photothermographic dry imaging material with a support having thereon an image forming layer containing photosensitive silver halide, a reducing agent for silver ions, a binder and a light-insensitive organic silver salt, and developing the photothermographic dry imaging material by a developing device, while the photothermographic dry imaging material is transported, wherein a surface having the image forming layer is brought into contact with sticky rollers during or before each of exposing and developing so as to make an amount of peel-off static electrification between the photothermographic dry imaging material and the sticky roller to be from -5 to +5 kV.