A method of forming fixed images includes charging a photoconductor; exposing the photoconductor to light; applying a thermally dissociating encapsulated toner, or an encapsulated toner whose shell is made of amorphous polyester to an electrostatic latent image formed on the photoconductor, developing the electrostatic latent image to form a visible image; transferring the formed visible image to a recording medium having a softening point of 100.degree. C. to 200.degree. C.; and fixing the transferred visible image onto the recording medium at a temperature of not less than 80.degree. C. and not more than 120.degree. C. by using a fixing roller which exerts a nip pressure of from 0.1 to 4.0 kg/cm.