Backward wrap-nip fuser system has an advantage for super high-speed fusing in continuous form laser printers for heavy-duty use. The fuser is mainly composed of a heat roll, a back-up roll and a pre-heater. A nip region is formed between the two rolls. The fuser has a wrap region on its heat roll just after its nip region. Additional thermal energy is supplied in the wrap region and it enables to supply sufficient energy to toner on the continuous paper in super high-speed printing.Local energy supply characteristics in the nip and the wrap regions are analyzed for designing the backward wrap-nip fuser system with effective energy supply. It is clarified that very high energy is supplied in very short period in the nip region and relatively gradual energy supply is made in longer period in the wrap region just after the nip region.