The total wave energy reflectance of the interface between the magnetized plasma before a conductor plate and the atmosphere or vacuum can be calculated by usin g the equivalent input impedance method. The result is that the reflection chara cteristics can be affected by electron numerical density, magnetized plasma thic kness, incidence wave frequency and magnetic intensity. Magnetic field can reduc e wave energy reflectance obviously only when the electron numerical density is of an appropriate value. The increased frequency of the incident wave must accom pany the augmented magnetic intensity, which is the condition that magnetized pl asma will absorb more energy of the electromagnetic wave.