Making use of the 3D stereoscopic net structure of the inner part of the porous metal, may increase enormously the radiating surface (actually increasing approximately 200 times above).Because with the method of electrification research of the porous metal's rate of passing the porosity is extremely high (above 97%) , the function of the metals'heat transmitting is good such as the copper, and they can be made into the columnar or the non-sign and other different shapes ,according to the customer's request.