An electrophotographic image forming apparatus includes a fixer for heating a printing paper while feeding the same; a cooling device for cooling the fixer; a paper transport device for supplying the printing paper to the fixer; and a controller for receiving a print command including a specification of printing conditions and controlling the fixer, the cooling device, and the paper transport device, wherein the controller includes: a device that controls the fixer to change the velocity that the fixer feeds the printing paper during a printing job according to the printing conditions, and a device that controls the cooling device to change the cooling performance of the cooling device during the printing job according to the velocity of the fixer.