The invention provides a method for improving heat exchange efficiency of a radiator and an electronic device. The potential of the radiator is close to the reference potential to inhibit the accumulation of dust. A radiation unit (200) is housed in a system chassis (105) of a portable computer (100). The heat from a CPU (121) is released by the radiation unit through a heat tube (201) and the radiator (209). The radiation unit (200) is combined with a metal frame (111) only by screws (206a, 206b). The radiator (209) performs electrostatic induction to increase the potential by an electrified body (325) on a main board (113). The radiator is connected with an AC/DC adapter by a grounding layer (321), and a grounding terminal of a power supply jack (311) of a chassis (327), thus the electric charge is neutralized.