Abstract: To provide a basis for the deep research of the transmission characteristic of magnetic radome, the reflection characteristics of an air-magnetic boundaryon a planarwavewith different incident angleswere investigated. By changing the parameters of magnetic media, the relationships between the reflection coefficient of power as well as the phase of reflection coefficient at the boundary and the incident angle was analyzed, and the effects of the magnetic property of media on the reflection coefficient and the phase were discussed. The research resultshows that a planarwave goingthrough amagnetic boundary does not produce the depolarization effect when the relative complex permittivity of the magnetic medium equals its relative complex permeability.