Millimeter wave heating is an important way of wireless energy transmission. Microcosmic characteristic of inorganic non-metallic material on millimeter wave heating is researched. Using the function of electrified particle movement in electromagnetic field, material permittivity damping performed with inner characteristics is put forward. With the study on energy absorbed efficiency using a double plat module, the result shows that temperature great affect material permittivity damping. The energy efficiency is much small under low or high temperature.