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The propagation property of microwave through chiral metamaterial based on a magnetic dimer is studied experimentally. Our results show two resonance peaks are obtained in the transmission spectrum, and they origin from the hybridization effect of magnetic resonance modes in this system. An optical activity is also observed in the transmission wave. Various elliptical polarization states appear in the transmission, and the polarization state changes dramatically around the magnetic resonance frequency: the transmitted wave becomes elliptically polarized with the major polarization axis almost perpendicular to that of the liner incident wave, and the ellipse is very compressed though it is not exactly the linear polarization. This coupled magnetic dimer system provides doable method of the designing of the tunable optically active medium and devices.