Herein, to obtain an integrated structure of circular polarization and laser output, we design a compound structure composed of gain and loss microcavities, magnetic microcavity, and metal layers. We use a 4×4 transfer matrix to study the optical properties of the structure. Results show that the compound structure can result in an intense Faraday rotation effect and gain transmission mode, and form multiple laser outputs with elliptical or circular polarizations in a certain range of structural parameters. In addition, for some specific structural parameters and wavelengths, the structure can produce an ultra-intense laser with circular polarization.