Abstract: Applying the mechanics of the propagation of high power microwave in atmosphere and the theory of plasma physics, a sort of new conception antenna-active lens antenna based on plasma is put forward.Its realization is summarized, characteristic parameters such as reflection, transmission, absorption, bandwidth and optimal frequency responding to different function are also analyzed and computed.As a result, this sort of antenna can be used to focus HPM operating waves or reflect transgressive HPM waves on the bass of forming passive filter device.