A fabrication method of a kind of new and flexible conductive substrate with millimeter wave material is inroduced. The metal coating is deposited on the surface of terylene substrate using the composite coating technology of vacuum magnetic control sputtering. The conductive performance and coating adhesion of the conductive substrate are tested. And the millimeter radiation characteristics in 3 mm waveband between the conductive substrate and the metal aluminum board are tested by a millimeter wave radiometer testing system. The results show that the conductive coating is uniform, flexible, ethereal and thin and has good coating adhesion strength and stronger conductive performance. The millimeter wave radiation of conductive substrate in 3 mm waveband corresponds to the performance of metal board.