In this paper, an interference suppression method based on beamforming is proposed. By combining minimum redundancy array (MRA) and frequency diverse array (FDA) multiple-input multiple-output (MIMO) radar, an FDA-MRMO radar suppression interference method is proposed. The MRA is adopted at its transmit port, breaking the limitation on the suppressible number of the mainlobe deceptive interference. The MRA is employed to obtain extended DOF by using a difference coarray, resulting in the suppressible number of order O(2M) with $M$ transmit element number. The mainlobe interference is suppressed by the transmit dimension nonadaptive method, and the sidelobe barrage interference is suppressed by the Generalized sidelobe canceller(GSC) method in the receive dimension. Simulation results demonstrate the effectiveness of the proposed method.